Chemical warfare
Encyclopedia
Chemical warfare involves using the toxic properties of chemical substance
Chemical substance
In chemistry, a chemical substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e. without breaking chemical bonds. They can be solids, liquids or gases.Chemical substances are...

s as weapons. This type of warfare is distinct from Nuclear warfare
Nuclear warfare
Nuclear warfare, or atomic warfare, is a military conflict or political strategy in which nuclear weaponry is detonated on an opponent. Compared to conventional warfare, nuclear warfare can be vastly more destructive in range and extent of damage...

 and Biological warfare
Biological warfare
Biological warfare is the use of biological toxins or infectious agents such as bacteria, viruses, and fungi with intent to kill or incapacitate humans, animals or plants as an act of war...

, which together make up NBC, the military acronym for Nuclear, Biological, and Chemical (warfare or weapons). Neither of these falls under the term conventional weapons which are primarily effective due to their destructive potential. Chemical warfare does not depend upon explosive
Explosion
An explosion is a rapid increase in volume and release of energy in an extreme manner, usually with the generation of high temperatures and the release of gases. An explosion creates a shock wave. If the shock wave is a supersonic detonation, then the source of the blast is called a "high explosive"...

 force to achieve an objective. Rather it depends upon the unique properties of the chemical agent weaponized. A lethal agent is designed to injure or incapacitate the enemy, or deny unhindered use of a particular area of terrain. Defoliant
Defoliant
A defoliant is any chemical sprayed or dusted on plants to cause its leaves to fall off. A classic example of a highly toxic defoliant is Agent Orange, which the United States armed forces used abundantly to defoliate regions of Vietnam during the Vietnam War from 1961 to 1970.Defoliants differ...

s are used to quickly kill vegetation and deny its use for cover and concealment. It can also be used against agriculture and livestock to promote hunger and starvation. With proper protective equipment, training, and decontamination measures, the primary effects of chemical weapons can be overcome. Many nations possess vast stockpile
Stockpile
A stockpile is a pile or storage location for bulk materials, forming part of the bulk material handling process.Stockpiles are used in many different areas, such as in a port, refinery or manufacturing facility. The stockpile is normally created by a stacker. A reclaimer is used to recover the...

s of weaponized agents in preparation for wartime use. The threat and the perceived threat have become strategic tools in planning both measures, and counter–measures.

Definition

Chemical warfare is different from the use of conventional weapon
Conventional weapon
The terms conventional weapons or conventional arms generally refer to weapons that are in relatively wide use that are not weapons of mass destruction, such as nuclear, chemical, and biological weapons. Conventional weapons include small arms and light weapons, sea and land mines, as well as ...

s or nuclear weapon
Nuclear weapon
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion. Both reactions release vast quantities of energy from relatively small amounts of matter. The first fission bomb test released the same amount...

s because the destructive effects of chemical weapons are not primarily due to any explosive
Explosion
An explosion is a rapid increase in volume and release of energy in an extreme manner, usually with the generation of high temperatures and the release of gases. An explosion creates a shock wave. If the shock wave is a supersonic detonation, then the source of the blast is called a "high explosive"...

 force. The offensive use of living organism
Organism
In biology, an organism is any contiguous living system . In at least some form, all organisms are capable of response to stimuli, reproduction, growth and development, and maintenance of homoeostasis as a stable whole.An organism may either be unicellular or, as in the case of humans, comprise...

s (such as anthrax) is considered biological warfare
Biological warfare
Biological warfare is the use of biological toxins or infectious agents such as bacteria, viruses, and fungi with intent to kill or incapacitate humans, animals or plants as an act of war...

 rather than chemical warfare; however, the use of nonliving toxic products produced by living organisms (e.g. toxin
Toxin
A toxin is a poisonous substance produced within living cells or organisms; man-made substances created by artificial processes are thus excluded...

s such as botulinum toxin
Botulinum toxin
Botulinum toxin is a protein produced by the bacterium Clostridium botulinum, and is considered the most powerful neurotoxin ever discovered. Botulinum toxin causes Botulism poisoning, a serious and life-threatening illness in humans and animals...

, ricin
Ricin
Ricin , from the castor oil plant Ricinus communis, is a highly toxic, naturally occurring protein. A dose as small as a few grains of salt can kill an adult. The LD50 of ricin is around 22 micrograms per kilogram Ricin , from the castor oil plant Ricinus communis, is a highly toxic, naturally...

, and saxitoxin
Saxitoxin
Saxitoxin is a neurotoxin naturally produced by certain species of marine dinoflagellates and cyanobacteria Saxitoxin (STX) is a neurotoxin naturally produced by certain species of marine dinoflagellates (Alexandrium sp., Gymnodinium sp., Pyrodinium sp.) and cyanobacteria Saxitoxin (STX) is a...

) is considered chemical warfare under the provisions of the Chemical Weapons Convention
Chemical Weapons Convention
The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

 (CWC). Under this Convention, any toxic chemical, regardless of its origin, is considered a chemical weapon unless it is used for purposes that are not prohibited (an important legal definition known as the General Purpose Criterion
General Purpose Criterion
__FORCETOC__The General Purpose Criterion Is an important concept in International law which broadly governs international agreements with respect to chemical weapons . Although the term is not found within such agreements, it is "regularly used" to describe the comprehensive nature of...

).

About 70 different chemicals have been used or stockpiled
Stockpile (military)
In military preparation, to stockpile is to move materiel, personnel, and command and control infrastructure to a suitable location in preparation for deployment, or to move such materials into the theatre of war in preparation for combat....

 as chemical warfare agents during the 20th century. The entire class known as Lethal Unitary Chemical Agents and Munitions
Lethal Unitary Chemical Agents and Munitions
A chemical weapon  is a device that uses chemicals formulated to inflict death or harm to human beings. They are classified as weapons of mass destruction, and have been "condemned by the civilised world". CW have been used in past conflicts—and preparedness doctrine anticipates the potential...

 have been scheduled for elimination by the CWC.

Under the Convention, chemicals that are toxic enough to be used as chemical weapons, or that may be used to manufacture such chemicals, are divided into three groups according to their purpose and treatment:
  • Schedule 1 – Have few, if any, legitimate uses. These may only be produced or used for research, medical, pharmaceutical or protective purposes (i.e. testing of chemical weapons sensors and protective clothing). Examples include nerve agents, ricin, lewisite
    Lewisite
    Lewisite is an organoarsenic compound, specifically an arsine. It was once manufactured in the U.S. and Japan as a chemical weapon, acting as a vesicant and lung irritant...

     and mustard gas
    Sulfur mustard
    The sulfur mustards, or sulphur mustards, commonly known as mustard gas, are a class of related cytotoxic, vesicant chemical warfare agents with the ability to form large blisters on exposed skin. Pure sulfur mustards are colorless, viscous liquids at room temperature...

    . Any production over 100 g must be notified to the OPCW and a country can have a stockpile of no more than one tonne of these chemicals.
  • Schedule 2 – Have no large-scale industrial uses, but may have legitimate small-scale uses. Examples include dimethyl methylphosphonate
    Dimethyl methylphosphonate
    Dimethyl methylphosphonate, or methylphosphonic acid dimethyl ester , is a colorless liquid with chemical formula 393 or CH3PO2. It is combustible. It emits a distinct odor. It can be found in household radiators, especially those installed in the former Soviet Bloc. In contact with water it...

    , a precursor to sarin
    Sarin
    Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...

     but which is also used as a flame retardant
    Flame retardant
    Flame retardants are chemicals used in thermoplastics, thermosets, textiles and coatings that inhibit or resist the spread of fire. These can be separated into several different classes of chemicals:...

     and Thiodiglycol
    Thiodiglycol
    Thiodiglycol, or bissulfide , is a viscous, clear to pale-yellow liquid used as a solvent. Its chemical formula is 4102, or HOCH2CH2SCH2CH2OH. It is miscible with acetone, alcohols, and chloroform...

     which is a precursor chemical used in the manufacture of mustard gas but is also widely used as a solvent in ink
    Ink
    Ink is a liquid or paste that contains pigments and/or dyes and is used to color a surface to produce an image, text, or design. Ink is used for drawing and/or writing with a pen, brush, or quill...

    s.
  • Schedule 3 – Have legitimate large-scale industrial uses. Examples include phosgene
    Phosgene
    Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...

     and chloropicrin
    Chloropicrin
    Chloropicrin, also known as PS, is a chemical compound with the structural formula Cl3CNO2. This colourless highly toxic liquid was once used in chemical warfare and is currently used as a fumigant and nematocide.-History:...

    . Both have been used as chemical weapons but phosgene is an important precursor in the manufacture of plastics and chloropicrin is used as a fumigant. The OPCW must be notified of, and may inspect, any plant producing more than 30 tonnes per year.

Technology

Chemical warfare technology timeline
Agents Dissemination Protection Detection
1900s Chlorine
Chlorine
Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine...


Chloropicrin
Chloropicrin
Chloropicrin, also known as PS, is a chemical compound with the structural formula Cl3CNO2. This colourless highly toxic liquid was once used in chemical warfare and is currently used as a fumigant and nematocide.-History:...


Phosgene
Phosgene
Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...


Mustard gas
Wind dispersal Gas masks, urinated-on gauze Smell
1910s Lewisite
Lewisite
Lewisite is an organoarsenic compound, specifically an arsine. It was once manufactured in the U.S. and Japan as a chemical weapon, acting as a vesicant and lung irritant...

Chemical shells Gas mask
Rosin oil clothing
 
1920s   Projectiles w/ central bursters CC-2 clothing  
1930s G-series nerve agents Aircraft bombs   Blister agent detectors
Color change paper
1940s   Missile warheads
Spray tanks
Protective ointment (mustard)
Collective protection
Gas mask w/ Whetlerite
 
1950s
1960s V-series nerve agents Aerodynamic Gas mask w/ water supply Nerve gas alarm
1970s
1980s   Binary munitions Improved gas masks
(protection, fit, comfort)
Laser detection
1990s Novichok nerve agents
Novichok agent
Novichok is a series of nerve agents that were developed by the Soviet Union in the 1970s and 1980s and allegedly the most deadly nerve agents ever made, with some variants possibly five to eight times more potent than VX, though this has never been proven...

     

Although crude chemical warfare has been employed in many parts of the world for thousands of years, "modern" chemical warfare began during World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 - see Poison gas in World War I
Poison gas in World War I
The use of chemical weapons in World War I ranged from disabling chemicals, such as tear gas and the severe mustard gas, to lethal agents like phosgene and chlorine. This chemical warfare was a major component of the first global war and first total war of the 20th century. The killing capacity of...

.

Initially, only well-known commercially available chemicals and their variants were used. These included chlorine
Chlorine
Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine...

 and phosgene
Phosgene
Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...

 gas. The methods used to disperse these agents during battle were relatively unrefined and inefficient. Even so, casualties could be heavy, due to the mainly static troop positions which were characteristic features of trench warfare
Trench warfare
Trench warfare is a form of occupied fighting lines, consisting largely of trenches, in which troops are largely immune to the enemy's small arms fire and are substantially sheltered from artillery...

.

Germany
Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

, the first side to employ chemical warfare on the battlefield, simply opened canisters of chlorine upwind of the opposing side and let the prevailing winds
Prevailing winds
Prevailing winds are winds that blow predominantly from a single general direction over a particular point on Earth's surface. The dominant winds are the trends in direction of wind with the highest speed over a particular point on the Earth's surface. A region's prevailing and dominant winds...

 do the dissemination. Soon after, the French
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 modified artillery
Artillery
Originally applied to any group of infantry primarily armed with projectile weapons, artillery has over time become limited in meaning to refer only to those engines of war that operate by projection of munitions far beyond the range of effect of personal weapons...

 munitions to contain phosgene – a much more effective method that became the principal means of delivery.

Since the development of modern chemical warfare in World War I, nations have pursued research and development
Research and development
The phrase research and development , according to the Organization for Economic Co-operation and Development, refers to "creative work undertaken on a systematic basis in order to increase the stock of knowledge, including knowledge of man, culture and society, and the use of this stock of...

 on chemical weapons that falls into four major categories: new and more deadly agents; more efficient methods of delivering agents to the target (dissemination); more reliable means of defense against chemical weapons; and more sensitive and accurate means of detecting chemical agents.

Chemical warfare agents

A chemical used in warfare is called a chemical warfare agent (CWA). About 70 different chemicals have been used or stockpiled as chemical warfare agents during the 20th and 21st-centuries. These agents may be in liquid, gas or solid form. Liquid agents are generally designed to evaporate quickly; such liquids are said to be volatile or have a high vapor pressure
Vapor pressure
Vapor pressure or equilibrium vapor pressure is the pressure of a vapor in thermodynamic equilibrium with its condensed phases in a closed system. All liquids have a tendency to evaporate, and some solids can sublimate into a gaseous form...

. Many chemical agents are made volatile so they can be dispersed over a large region quickly.

The earliest target of chemical warfare agent research was not toxicity, but development of agents that can affect a target through the skin and clothing, rendering protective gas mask
Gas mask
A gas mask is a mask put on over the face to protect the wearer from inhaling airborne pollutants and toxic gases. The mask forms a sealed cover over the nose and mouth, but may also cover the eyes and other vulnerable soft tissues of the face. Some gas masks are also respirators, though the word...

s useless. In July 1917, the Germans employed mustard gas. Mustard gas easily penetrates leather and fabric to inflict painful burns on the skin.

Chemical warfare agents are divided into lethal and incapacitating categories. A substance is classified as incapacitating if less than 1/100 of the lethal dose
Lethal dose
A lethal dose is an indication of the lethality of a given substance or type of radiation. Because resistance varies from one individual to another, the 'lethal dose' represents a dose at which a given percentage of subjects will die...

 causes incapacitation, e.g., through nausea or visual problems. The distinction between lethal and incapacitating substances is not fixed, but relies on a statistical average called the .

Persistency

One way to classify chemical warfare agents is according to their persistency, a measure of the length of time that a chemical agent remains effective after dissemination. Chemical agents are classified as persistent or nonpersistent.

Agents classified as nonpersistent lose effectiveness after only a few minutes or hours or even only a few seconds. Purely gaseous agents such as chlorine are nonpersistent, as are highly volatile agents such as sarin
Sarin
Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...

 and most other nerve agents. Tactically, nonpersistent agents are very useful against targets that are to be taken over and controlled very quickly.

Apart from the agent used, the delivery mode is very important. To achieve a nonpersistent deployment, the agent is dispersed into very small droplets comparable with the mist produced by an aerosol can. In this form not only the gaseous part of the agent (around 50%) but also the fine aerosol can be inhaled or taken up by the skin.

Modern doctrine requires very high concentrations almost instantly in order to be effective (one breath should contain a lethal dose of the agent). To achieve this, the primary weapons used would be rocket artillery or bombs and large ballistic missiles with cluster warheads. The contamination in the target area is only low or not existent and after four hours sarin or similar agents are not detectable anymore.

By contrast, persistent agents tend to remain in the environment for as long as several weeks, complicating decontamination. Defense against persistent agents requires shielding for extended periods of time. Non-volatile liquid agents, such as blister agents and the oily VX
VX (nerve agent)
VX, IUPAC name O-ethyl S-[2-ethyl] methylphosphonothioate, is an extremely toxic substance whose only application is in chemical warfare as a nerve agent. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations in UN Resolution 687...

 nerve agent, do not easily evaporate into a gas, and therefore present primarily a contact hazard.

The droplet size used for persistent delivery goes up to 1 mm increasing the falling speed and therefore about 80% of the deployed agent reaches the ground, resulting in heavy contamination. This implies, that persistent deployment does not aim at annihilating the enemy but to constrain him.

Possible targets include enemy flank positions (averting possible counter attacks), artillery regiments, commando posts or supply lines. Possible weapons to be used are wide spread, because the fast delivery of high amounts is not a critical factor.

A special form of persistent agents are thickened agents. These comprise a common agent mixed with thickeners to provide gelatinous, sticky agents. Primary targets for this kind of use include airfields, due to the increased persistency and difficulty of decontaminating affected areas.

Classes

Chemical weapons are inert
Inert
-Chemistry:In chemistry, the term inert is used to describe a substance that is not chemically reactive.The noble gases were previously known as inert gases because of their perceived lack of participation in any chemical reactions...

 agents that come in four categories: choking
Pulmonary agent
A pulmonary agent is a chemical weapon agent designed to impede a victim's ability to breathe. They operate by causing a build-up of fluids in the lungs which then leads to...

, blister, blood
Blood agent
A blood agent is a toxic chemical agent that affects the body by being absorbed into the blood. They are fast-acting, potentially lethal poisons that typically manifest at room temperature as volatile colorless gases with a faint odor. Blood agents are either cyanide- or...

 and nerve
Nerve agent
Nerve agents are a class of phosphorus-containing organic chemicals that disrupt the mechanism by which nerves transfer messages to organs...

. The agents are organized into several categories according to the manner in which they affect the human body. The names and number of categories varies slightly from source to source, but in general, types of chemical warfare agents are as follows:
There are other chemicals used militarily that are not scheduled by the Chemical Weapons Convention
Chemical Weapons Convention
The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

, and thus are not controlled under the CWC treaties. These include:
  • Defoliant
    Defoliant
    A defoliant is any chemical sprayed or dusted on plants to cause its leaves to fall off. A classic example of a highly toxic defoliant is Agent Orange, which the United States armed forces used abundantly to defoliate regions of Vietnam during the Vietnam War from 1961 to 1970.Defoliants differ...

    s that destroy vegetation, but are not immediately toxic to human beings. Some batches of Agent Orange
    Agent Orange
    Agent Orange is the code name for one of the herbicides and defoliants used by the U.S. military as part of its herbicidal warfare program, Operation Ranch Hand, during the Vietnam War from 1961 to 1971. Vietnam estimates 400,000 people were killed or maimed, and 500,000 children born with birth...

    , for instance, used by the United States in Vietnam, contained dioxins as manufacturing impurities. Dioxins, rather than Agent Orange itself, have long-term cancer effects and for causing genetic damage leading to serious birth deformities.
  • Incendiary
    Incendiary device
    Incendiary weapons, incendiary devices or incendiary bombs are bombs designed to start fires or destroy sensitive equipment using materials such as napalm, thermite, chlorine trifluoride, or white phosphorus....

     or explosive
    Explosive material
    An explosive material, also called an explosive, is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure...

     chemicals (such as napalm
    Napalm
    Napalm is a thickening/gelling agent generally mixed with gasoline or a similar fuel for use in an incendiary device, primarily as an anti-personnel weapon...

    , extensively used by the United States in Vietnam, or dynamite
    Dynamite
    Dynamite is an explosive material based on nitroglycerin, initially using diatomaceous earth , or another absorbent substance such as powdered shells, clay, sawdust, or wood pulp. Dynamites using organic materials such as sawdust are less stable and such use has been generally discontinued...

    ) because their destructive effects are primarily due to fire or explosive force, and not direct chemical action.
  • Virus
    Virus
    A virus is a small infectious agent that can replicate only inside the living cells of organisms. Viruses infect all types of organisms, from animals and plants to bacteria and archaea...

    es, bacteria
    Bacteria
    Bacteria are a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals...

    , or other organisms. Their use is classified as biological warfare
    Biological warfare
    Biological warfare is the use of biological toxins or infectious agents such as bacteria, viruses, and fungi with intent to kill or incapacitate humans, animals or plants as an act of war...

    . Toxin
    Toxin
    A toxin is a poisonous substance produced within living cells or organisms; man-made substances created by artificial processes are thus excluded...

    s produced by living organisms are considered chemical weapons, although the boundary is blurry. Toxins are covered by the Biological Weapons Convention
    Biological Weapons Convention
    The Convention on the Prohibition of the Development, Production and Stockpiling of Bacteriological and Toxin Weapons and on their Destruction was the first multilateral disarmament treaty banning the...

    .

Designations

Most chemical weapons are assigned a one- to three-letter "NATO weapon designation" in addition to, or in place of, a common name. Binary munitions
Binary chemical weapon
Binary chemical weapons or munitions are chemical weapons wherein the toxic agent is not contained within the weapon in its active state, but in the form of two chemical precursors, physically separated within the weapon...

, in which precursors for chemical warfare agents are automatically mixed in shell to produce the agent just prior to its use, are indicated by a "-2" following the agent's designation (for example, GB-2 and VX-2).

Some examples are given below:
Blood agents: Vesicants:
  • Cyanogen chloride
    Cyanogen chloride
    Cyanogen chloride is an inorganic compound with the formula NCCl. This linear, triatomic pseudohalogen is an easily condensed colorless gas. More commonly encountered in the laboratory is the related compound cyanogen bromide, a room-temperature solid that is widely used in biochemical analysis and...

    : CK
  • Hydrogen cyanide: AC
  • Lewisite
    Lewisite
    Lewisite is an organoarsenic compound, specifically an arsine. It was once manufactured in the U.S. and Japan as a chemical weapon, acting as a vesicant and lung irritant...

    : L
  • Sulfur mustard: H, HD, HS, HT
  • Pulmonary agents: Incapacitating agents:
  • Phosgene
    Phosgene
    Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...

    : CG
  • Quinuclidinyl benzilate
    3-Quinuclidinyl benzilate
    3-quinuclidinyl benzilate , IUPAC name 1-azabicyclo[2.2.2]Oct-3-yl α-hydroxy-α-phenylbenzeneacetate, is an odorless military incapacitating agent. Its NATO code is BZ...

    : BZ
  • Lachrymatory agents: Nerve agents:
  • Pepper spray
    Pepper spray
    Pepper spray, also known as OC spray , OC gas, and capsicum spray, is a lachrymatory agent that is used in riot control, crowd control and personal self-defense, including defense against dogs and bears...

    : OC
  • Tear gas: CN, CS, CR
  • Sarin
    Sarin
    Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...

    : GB
  • VE
    VE (nerve agent)
    VE is a "V-series" nerve agent closely related to the better-known VX nerve agent.Like most of the agents in the V-series , VE has not been extensively studied outside of military science...

    , VG
    VG (nerve agent)
    VG is a "V-series" nerve agent chemically similar to the better-known VX nerve agent. Tetram is the common Russian name for the substance...

    , VM
    VM (nerve agent)
    VM is a "V-series" nerve agent closely related to the better-known VX nerve agent.Like most of the agents in the V-series , VM has not been extensively studied outside of military science...

    , VX
    VX (nerve agent)
    VX, IUPAC name O-ethyl S-[2-ethyl] methylphosphonothioate, is an extremely toxic substance whose only application is in chemical warfare as a nerve agent. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations in UN Resolution 687...


  • Delivery

    The most important factor in the effectiveness of chemical weapons is the efficiency of its delivery, or dissemination, to a target. The most common techniques include munitions (such as bombs, projectiles, warheads) that allow dissemination at a distance and spray tanks which disseminate from low-flying aircraft. Developments in the techniques of filling and storage of munitions have also been important.

    Although there have been many advances in chemical weapon delivery since World War I, it is still difficult to achieve effective dispersion. The dissemination is highly dependent on atmospheric conditions because many chemical agents act in gaseous form. Thus, weather observations and forecasting are essential to optimize weapon delivery and reduce the risk of injuring friendly forces.

    Dispersion

    Dispersion is placing the chemical agent upon or adjacent to a target immediately before dissemination, so that the material is most efficiently used. Dispersion is the simplest technique of delivering an agent to its target. The most common techniques are munitions, bombs, projectiles, spray tanks and warheads.

    World War I
    World War I
    World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

     saw the earliest implementation of this technique. The actual first chemical ammunition was the French
    Military history of France
    The military history of France encompasses an immense panorama of conflicts and struggles extending for more than 2,000 years across areas including modern France, greater Europe, and European territorial possessions overseas....

     26 mm cartouche suffocante rifle grenade
    Rifle grenade
    A rifle grenade is a grenade that uses a rifle-based launcher to permit a longer effective range than would be possible if the grenade was thrown by hand...

    , fired from a flare carbine
    Flare gun
    A flare gun is a firearm that launches flares. It is typically used for signalling, as distress signalling, at sea or from the ground to aircraft...

    . It contained 35g of the tear-producer
    Lachrymatory agent
    Tear gas, formally known as a lachrymatory agent or lachrymator , is a non-lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness...

     ethylbromacetate, and was used in autumn 1914 – with little effect on the Germans.

    The Germans
    Military history of Germany
    While German-speaking people have a long history, Germany as a nation-state dates only from 1871. Earlier periods are subject to definition debates. The Franks, for instance, were a union of Germanic tribes; nevertheless, some of the Franks later identified themselves as Dutch, Flemish, French...

     on the other hand tried to increase the effect of 10.5 cm shrapnel shells by adding an irritant – dianisidine chlorosulfonate. Its use went unnoticed by the British when it was used against them at Neuve Chapelle
    Battle of Neuve Chapelle
    The Battles of Neuve Chapelle and Artois was a battle in the First World War. It was a British offensive in the Artois region and broke through at Neuve-Chapelle but they were unable to exploit the advantage.The battle began on 10 March 1915...

     in October 1914. Hans Tappen, a chemist in the Heavy Artillery Department of the War Ministry, suggested to his brother, the Chief of the Operations Branch at German General Headquarters, the use of the tear-gases benzyl bromide
    Benzyl bromide
    Benzyl bromide, or α-bromotoluene, is an organic compound consisting of a benzene ring substituted with a bromomethyl group. It can be prepared by the bromination of toluene at room temperature in air, using manganese oxide as a heterogeneous catalyst...

     or xylyl bromide
    Xylyl bromide
    Xylyl bromide, also known as methylbenzyl bromide or T-stoff, is a poisonous organic chemical compound with the formula C8H9Br, formerly used as a tear gas...

    .

    Shells were tested successfully at the Wahn artillery range near Cologne
    Cologne
    Cologne is Germany's fourth-largest city , and is the largest city both in the Germany Federal State of North Rhine-Westphalia and within the Rhine-Ruhr Metropolitan Area, one of the major European metropolitan areas with more than ten million inhabitants.Cologne is located on both sides of the...

     on 9 January 1915, and an order was placed for 15 cm howitzer shells, designated ‘T-shells’ after Tappen. A shortage of shells limited the first use against the Russians at Bolimów on 31 January 1915; the liquid failed to vaporize in the cold weather, and again the experiment went unnoticed by the Allies.

    The first effective use were when the German forces at the Second Battle of Ypres
    Second Battle of Ypres
    The Second Battle of Ypres was the first time Germany used poison gas on a large scale on the Western Front in the First World War and the first time a former colonial force pushed back a major European power on European soil, which occurred in the battle of St...

     simply opened cylinders of chlorine
    Chlorine
    Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine...

     and allowed the wind
    Wind
    Wind is the flow of gases on a large scale. On Earth, wind consists of the bulk movement of air. In outer space, solar wind is the movement of gases or charged particles from the sun through space, while planetary wind is the outgassing of light chemical elements from a planet's atmosphere into space...

     to carry the gas across enemy lines. While simple, this technique had numerous disadvantages. Moving large numbers of heavy gas cylinders to the front-line positions from where the gas would be released was a lengthy and difficult logistical task.

    Stockpiles of cylinders had to be stored at the front line, posing a great risk if hit by artillery shells. Gas delivery depended greatly on wind speed
    Wind speed
    Wind speed, or wind velocity, is a fundamental atmospheric rate.Wind speed affects weather forecasting, aircraft and maritime operations, construction projects, growth and metabolism rate of many plant species, and countless other implications....

     and direction. If the wind was fickle, as at Loos
    Battle of Loos
    The Battle of Loos was one of the major British offensives mounted on the Western Front in 1915 during World War I. It marked the first time the British used poison gas during the war, and is also famous for the fact that it witnessed the first large-scale use of 'new' or Kitchener's Army...

    , the gas could blow back, causing friendly casualties.

    Gas clouds gave plenty of warning, allowing the enemy time to protect themselves, though many soldiers found the sight of a creeping gas cloud unnerving. This made the gas doubly effective, as, in addition to damaging the enemy physically, it also had a psychological effect on the intended victims.

    Another disadvantage was that gas clouds had limited penetration, capable only of affecting the front-line trenches before dissipating. Although it produced limited results in World War I, this technique shows how simple chemical weapon dissemination can be.

    Shortly after this "open canister" dissemination, French forces developed a technique for delivery of phosgene
    Phosgene
    Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...

     in a non-explosive artillery
    Artillery
    Originally applied to any group of infantry primarily armed with projectile weapons, artillery has over time become limited in meaning to refer only to those engines of war that operate by projection of munitions far beyond the range of effect of personal weapons...

     shell. This technique overcame many of the risks of dealing with gas in cylinders. First, gas shells were independent of the wind and increased the effective range of gas, making any target within reach of guns vulnerable. Second, gas shells could be delivered without warning, especially the clear, nearly odorless phosgene– there are numerous accounts of gas shells, landing with a "plop" rather than exploding, being initially dismissed as dud high explosive or shrapnel shells, giving the gas time to work before the soldiers were alerted and took precautions.

    The major drawback of artillery delivery was the difficulty of achieving a killing concentration. Each shell had a small gas payload and an area would have to be subjected to saturation bombardment to produce a cloud to match cylinder delivery. A British solution to the problem was the Livens Projector
    Livens Projector
    The Livens Projector was a simple mortar-like weapon that could throw large drums filled with flammable or toxic chemicals. In the First World War, the Livens Projector became the standard means of delivering gas attacks and it remained in the arsenal of the British Army until the early years of...

    . This was effectively a large-bore mortar, dug into the ground that used the gas cylinders themselves as projectiles - firing a 14 kg cylinder up to 1500 m. This combined the gas volume of cylinders with the range of artillery.

    Over the years, there were some refinements in this technique. In the 1950s and early 1960s, chemical artillery rockets and cluster bomb
    Cluster bomb
    A cluster munition is a form of air-dropped or ground-launched explosive weapon that releases or ejects smaller sub-munitions. Commonly, this is a cluster bomb that ejects explosive bomblets that are designed to kill enemy personnel and destroy vehicles...

    s contained a multitude of submunitions, so that a large number of small clouds of the chemical agent would form directly on the target.

    Thermal dissemination

    Thermal dissemination is the use of explosives or pyrotechnics to deliver chemical agents. This technique, developed in the 1920s, was a major improvement over earlier dispersal techniques, in that it allowed significant quantities of an agent to be disseminated over a considerable distance. Thermal dissemination remains the principal method of disseminating chemical agents today.

    Most thermal dissemination devices consist of a bomb
    Bomb
    A bomb is any of a range of explosive weapons that only rely on the exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy...

     or projectile shell
    Shell (projectile)
    A shell is a payload-carrying projectile, which, as opposed to shot, contains an explosive or other filling, though modern usage sometimes includes large solid projectiles properly termed shot . Solid shot may contain a pyrotechnic compound if a tracer or spotting charge is used...

     that contains a chemical agent and a central "burster" charge; when the burster detonates, the agent is expelled laterally.

    Thermal dissemination devices, though common, are not particularly efficient. First, a percentage of the agent is lost by incineration in the initial blast and by being forced onto the ground. Second, the sizes of the particles vary greatly because explosive dissemination produces a mixture of liquid droplets of variable and difficult to control sizes.

    The efficacy of thermal detonation is greatly limited by the flammability of some agents. For flammable aerosols, the cloud is sometimes totally or partially ignited by the disseminating explosion in a phenomenon called flashing. Explosively disseminated VX
    VX (nerve agent)
    VX, IUPAC name O-ethyl S-[2-ethyl] methylphosphonothioate, is an extremely toxic substance whose only application is in chemical warfare as a nerve agent. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations in UN Resolution 687...

     will ignite roughly one third of the time. Despite a great deal of study, flashing is still not fully understood, and a solution to the problem would be a major technological advance.

    Despite the limitations of central bursters, most nations use this method in the early stages of chemical weapon development, in part because standard munitions can be adapted to carry the agents.

    Aerodynamic dissemination

    Aerodynamic dissemination is the non-explosive delivery of a chemical agent from an aircraft, allowing aerodynamic stress to disseminate the agent. This technique is the most recent major development in chemical agent dissemination, originating in the mid-1960s.

    This technique eliminates many of the limitations of thermal dissemination by eliminating the flashing effect and theoretically allowing precise control of particle size. In actuality, the altitude of dissemination, wind direction and velocity, and the direction and velocity of the aircraft greatly influence particle size. There are other drawbacks as well; ideal deployment requires precise knowledge of aerodynamics
    Aerodynamics
    Aerodynamics is a branch of dynamics concerned with studying the motion of air, particularly when it interacts with a moving object. Aerodynamics is a subfield of fluid dynamics and gas dynamics, with much theory shared between them. Aerodynamics is often used synonymously with gas dynamics, with...

     and fluid dynamics
    Fluid dynamics
    In physics, fluid dynamics is a sub-discipline of fluid mechanics that deals with fluid flow—the natural science of fluids in motion. It has several subdisciplines itself, including aerodynamics and hydrodynamics...

    , and because the agent must usually be dispersed within the boundary layer
    Boundary layer
    In physics and fluid mechanics, a boundary layer is that layer of fluid in the immediate vicinity of a bounding surface where effects of viscosity of the fluid are considered in detail. In the Earth's atmosphere, the planetary boundary layer is the air layer near the ground affected by diurnal...

     (less than 200–300 ft above the ground), it puts pilots at risk.

    Significant research is still being applied toward this technique. For example, by modifying the properties of the liquid, its breakup when subjected to aerodynamic stress can be controlled and an idealized particle distribution achieved, even at supersonic speed
    Supersonic
    Supersonic speed is a rate of travel of an object that exceeds the speed of sound . For objects traveling in dry air of a temperature of 20 °C this speed is approximately 343 m/s, 1,125 ft/s, 768 mph or 1,235 km/h. Speeds greater than five times the speed of sound are often...

    . Additionally, advances in fluid dynamics, computer modeling, and weather forecasting
    Weather forecasting
    Weather forecasting is the application of science and technology to predict the state of the atmosphere for a given location. Human beings have attempted to predict the weather informally for millennia, and formally since the nineteenth century...

     allow an ideal direction, speed, and altitude to be calculated, such that warfare agent of a predetermined particle size can predictably and reliably hit a target.

    Protection against chemical warfare

    Ideal protection begins with nonproliferation treaties such as the Chemical Weapons Convention
    Chemical Weapons Convention
    The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

    , and detecting, very early, the signatures of someone building a chemical weapons capability. These include a wide range of intelligence disciplines, such as economic analysis of exports of dual-use chemicals and equipment, human intelligence (HUMINT
    HUMINT
    HUMINT, a syllabic abbreviation of the words HUMan INTelligence, refers to intelligence gathering by means of interpersonal contact, as opposed to the more technical intelligence gathering disciplines such as SIGINT, IMINT and MASINT...

    ) such as diplomatic, refugee, and agent reports; photography from satellites, aircraft and drones (IMINT
    IMINT
    Imagery Intelligence , is an intelligence gathering discipline which collects information via satellite and aerial photography. As a means of collecting intelligence, IMINT is a subset of intelligence collection management, which, in turn, is a subset of intelligence cycle management...

    ); examination of captured equipment (TECHINT
    Techint
    Techint is a conglomerate multinational company founded in Milan in September 1945 by Italian industrialist Agostino Rocca and headquartered in Milan and Buenos Aires . Techint comprises more than 100 companies operating worldwide in the following areas of business: Engineering & Construction,...

    ); communications intercepts (COMINT); and detection of chemical manufacturing and chemical agents themselves (MASINT).

    If all the preventive measures fail and there is a clear and present danger, then there is a need for detection of chemical attacks,
    collective protection, and decontamination. Since industrial accidents can cause dangerous chemical releases (e.g., the Bhopal disaster
    Bhopal disaster
    The Bhopal disaster also known as Bhopal Gas Tragedy was a gas leak incident in India, considered one of the world's worst industrial catastrophes. It occurred on the night of December 2–3, 1984 at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, India...

    ), these activities are things that civilian, as well as military, organizations must be prepared to carry out. In civilian situations in developed countries
    Developed country
    A developed country is a country that has a high level of development according to some criteria. Which criteria, and which countries are classified as being developed, is a contentious issue...

    , these are duties of HAZMAT
    Hazmat
    Hazmat, HazMat and similar terms can refer to:* Hazardous materials and items—see Dangerous goods** Hazchem—a system of hazardous chemical classification and firefighting modes** A hazmat suit is a type of protective clothing...

     organizations, which most commonly are part of fire departments.

    Detection has been referred to above, as a technical MASINT
    Measurement and Signature Intelligence
    Measurement and signature intelligence is a branch of intelligence gathering activities.MASINT, may have aspects of intelligence analysis management, since certain aspects of MASINT, such as the analysis of electromagnetic radiation received by signals intelligence are more of an analysis...

     discipline; specific military procedures, which are usually the model for civilian procedures, depend on the equipment, expertise, and personnel available. When chemical agents are detected, an alarm
    Alarm
    An alarm device or system of alarm devices gives an audible or visual alarm signal about a problem or condition.Alarm devices include:* burglar alarms, designed to warn of burglaries; this is often a silent alarm: the police or guards are warned without indication to the burglar, which increases...

     needs to sound, with specific warnings over emergency broadcasts and the like. There may be a warning to expect an attack.

    If, for example, the captain of a US Navy
    United States Navy
    The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

     ship believes there is a serious threat of chemical, biological, or radiological attack, the crew may be ordered to set Circle William, which means closing all openings to outside air, running breathing air through filters, and possibly starting a system that continually washes down the exterior surfaces. Civilian authorities dealing with an attack or a toxic chemical accident will invoke the Incident Command System
    Incident Command System
    The Incident Command System is "a systematic tool used for the command, control, and coordination of emergency response" according to the United States Federal Highway Administration...

    , or local equivalent, to coordinate defensive measures.

    Individual protection starts with a gas mask
    Gas mask
    A gas mask is a mask put on over the face to protect the wearer from inhaling airborne pollutants and toxic gases. The mask forms a sealed cover over the nose and mouth, but may also cover the eyes and other vulnerable soft tissues of the face. Some gas masks are also respirators, though the word...

     and, depending on the nature of the threat, through various levels of protective clothing up to a complete chemical-resistant suit with a self-contained air supply. The US military defines various levels of MOPP
    MOPP
    MOPP is a military term used to describe protective gear to be used in a toxic environment, i.e., during a chemical, biological, radiological, or nuclear strike:* Protective mask — Commonly referred to as a gas mask or pro mask...

     (mission-oriented protective posture) from mask to full chemical resistant suits; Hazmat suits are the civilian equivalent, but go farther to include a fully independent air supply, rather than the filters of a gas mask.

    Collective protection allows continued functioning of groups of people in buildings or shelters, the latter which may be fixed, mobile, or improvised. With ordinary buildings, this may be as basic as plastic sheeting and tape, although if the protection needs to be continued for any appreciable length of time, there will need to be an air supply, typically a scaled-up version of a gas mask.

    Decontamination

    Decontamination varies with the particular chemical agent used. Some nonpersistent agents, such as most pulmonary agents such as chlorine
    Chlorine
    Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine...

     and phosgene
    Phosgene
    Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...

    , blood gases, and nonpersistent nerve gases (e.g., GB
    Sarin
    Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...

    ) will dissipate from open areas, although powerful exhaust fans may be needed to clear out buildings where they have accumulated.

    In some cases, it might be necessary to neutralize them chemically, as with ammonia
    Ammonia
    Ammonia is a compound of nitrogen and hydrogen with the formula . It is a colourless gas with a characteristic pungent odour. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers. Ammonia, either directly or...

     as a neutralizer for hydrogen cyanide or chlorine
    Chlorine
    Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine...

    . Riot control agents such as CS
    CS gas
    2-chlorobenzalmalononitrile is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent...

     will dissipate in an open area, but things contaminated with CS powder need to be aired out, washed by people wearing protective gear, or safely discarded.

    Mass decontamination
    Mass decontamination
    Mass decontamination is the decontamination of large numbers of people, in the event of industrial, accidental, or intentional contamination by toxic, infective, caustic, polluted, or otherwise unhealthful or damaging substances....

     is a less common requirement for people than equipment, since people may be immediately affected and treatment is the action required. It is a requirement when people have been contaminated with persistent agents. Treatment and decontamination may need to be simultaneous, with the medical personnel protecting themselves so they can function.

    There may need to be immediate intervention to prevent death, such as injection of atropine for nerve agents. Decontamination is especially important for people contaminated with persistent agents; many of the fatalities after the explosion of a WWII US ammunition ship carrying mustard gas
    Air Raid on Bari
    The air raid on Bari was an air attack by German bombers on Allied forces and shipping in Bari, Italy on 2 December 1943 during World War II. In the attack, 105 German Junkers Ju 88 bombers of Luftflotte 2, achieving complete surprise, bombed shipping and personnel operating in support of the...

    , in the harbor of Bari, Italy, after a German bombing on 2 December 1943, came when rescue workers, not knowing of the contamination, bundled cold, wet seamen in tight-fitting blankets.

    For decontaminating equipment and buildings exposed to persistent agents, such as blister agents, VX
    VX (nerve agent)
    VX, IUPAC name O-ethyl S-[2-ethyl] methylphosphonothioate, is an extremely toxic substance whose only application is in chemical warfare as a nerve agent. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations in UN Resolution 687...

     or other agents made persistent by mixing with a thickener, special equipment and materials might be needed. Some type of neutralizing agent will be needed; e.g. in the form of a spraying device with neutralizing agents such as Chlorine, Fichlor, strong alkaline solutions or enzymes. In other cases, a specific chemical decontaminant will be required.

    Sociopolitical climate

    The study of chemicals and their military uses was widespread in China
    China
    Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

     and India. The use of toxic materials has historically been viewed with mixed emotions and moral qualms in the West. The practical and ethical problems surrounding poison warfare appeared in ancient Greek myths about Hercules' invention of poison arrows and Odysseus's use of toxic projectiles. There are many instances of the use of chemical weapons in battles documented in Greek and Roman historical texts; the earliest example was the deliberate poisoning of Kirrha's water supply with hellebore in the First Sacred War, Greece, about 590 BC.

    One of the earliest reactions to the use of chemical agents was from Rome. Struggling to defend themselves from the Roman legion
    Roman legion
    A Roman legion normally indicates the basic ancient Roman army unit recruited specifically from Roman citizens. The organization of legions varied greatly over time but they were typically composed of perhaps 5,000 soldiers, divided into maniples and later into "cohorts"...

    s, Germanic
    Germanic peoples
    The Germanic peoples are an Indo-European ethno-linguistic group of Northern European origin, identified by their use of the Indo-European Germanic languages which diversified out of Proto-Germanic during the Pre-Roman Iron Age.Originating about 1800 BCE from the Corded Ware Culture on the North...

     tribes poisoned the wells of their enemies, with Roman jurists having been recorded as declaring "armis bella non venenis geri", meaning "war is fought with weapon
    Weapon
    A weapon, arm, or armament is a tool or instrument used with the aim of causing damage or harm to living beings or artificial structures or systems...

    s, not with poison
    Poison
    In the context of biology, poisons are substances that can cause disturbances to organisms, usually by chemical reaction or other activity on the molecular scale, when a sufficient quantity is absorbed by an organism....

    s." Yet the Romans themselves resorted to poisoning wells of besieged cities in Anatolia in the 2nd century BCE.

    Before 1915 the use of poisonous chemicals in battle was typically the result of local initiative, and not the result of an active government chemical weapons program. There are many reports of the isolated use of chemical agents in individual battles or siege
    Siege
    A siege is a military blockade of a city or fortress with the intent of conquering by attrition or assault. The term derives from sedere, Latin for "to sit". Generally speaking, siege warfare is a form of constant, low intensity conflict characterized by one party holding a strong, static...

    s, but there was no true tradition of their use outside of incendiaries
    Incendiary device
    Incendiary weapons, incendiary devices or incendiary bombs are bombs designed to start fires or destroy sensitive equipment using materials such as napalm, thermite, chlorine trifluoride, or white phosphorus....

     and smoke. Despite this tendency, there have been several attempts to initiate large-scale implementation of poison gas in several wars, but with the notable exception of World War I, the responsible authorities generally rejected the proposals for ethical reasons.

    For example, in 1854 Lyon Playfair
    Lyon Playfair, 1st Baron Playfair
    Lyon Playfair, 1st Baron Playfair GCB, PC, FRS was a Scottish scientist and Liberal politician.-Background and education:...

     (later 1st Baron Playfair, GCB, PC, FRS (1 May 1818 – 29 May 1898), a British
    United Kingdom
    The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

     chemist, proposed using a cacodyl cyanide
    Cyanide
    A cyanide is a chemical compound that contains the cyano group, -C≡N, which consists of a carbon atom triple-bonded to a nitrogen atom. Cyanides most commonly refer to salts of the anion CN−. Most cyanides are highly toxic....

    -filled artillery
    Artillery
    Originally applied to any group of infantry primarily armed with projectile weapons, artillery has over time become limited in meaning to refer only to those engines of war that operate by projection of munitions far beyond the range of effect of personal weapons...

     shell against enemy ships during the Crimean War
    Crimean War
    The Crimean War was a conflict fought between the Russian Empire and an alliance of the French Empire, the British Empire, the Ottoman Empire, and the Kingdom of Sardinia. The war was part of a long-running contest between the major European powers for influence over territories of the declining...

    . The British Ordnance Department rejected the proposal as "as bad a mode of warfare as poisoning the wells of the enemy."

    Efforts to eradicate chemical weapons

    • August 27, 1874: The Brussels Declaration Concerning the Laws and Customs of War is signed, specifically forbidding the "employment of poison or poisoned weapons."
    • September 4, 1900: The Hague Conference
      Hague Conventions (1899 and 1907)
      The Hague Conventions were two international treaties negotiated at international peace conferences at The Hague in the Netherlands: The First Hague Conference in 1899 and the Second Hague Conference in 1907...

      , which includes a declaration banning the "use of projectiles the object of which is the diffusion of asphyxiating or deleterious gases," enters into force.
    • February 6, 1922: After World War I, the Washington Arms Conference Treaty prohibited the use of asphyxiating, poisonous or other gases. It was signed by the United States, Britain, Japan, France, and Italy, but France objected to other provisions in the treaty and it never went into effect.
    • September 7, 1929: The Geneva Protocol
      Geneva Protocol
      The Protocol for the Prohibition of the Use in War of Asphyxiating, Poisonous or other Gases, and of Bacteriological Methods of Warfare, usually called the Geneva Protocol, is a treaty prohibiting the first use of chemical and biological weapons. It was signed at Geneva on June 17, 1925 and entered...

       enters into force, prohibiting the use of poison gas.

    Chemical weapon proliferation

    Despite numerous efforts to reduce or eliminate them, some nations continue to research and/or stockpile chemical warfare agents. To the right is a summary of the nations that have either declared weapon stockpiles or are suspected of secretly stockpiling or possessing CW research programs. Notable examples include United States
    United States
    The United States of America is a federal constitutional republic comprising fifty states and a federal district...

     and Russia
    Russia
    Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

    .

    Former US Vice President
    Vice President of the United States
    The Vice President of the United States is the holder of a public office created by the United States Constitution. The Vice President, together with the President of the United States, is indirectly elected by the people, through the Electoral College, to a four-year term...

     Dick Cheney
    Dick Cheney
    Richard Bruce "Dick" Cheney served as the 46th Vice President of the United States , under George W. Bush....

     opposed the signing ratification of a treaty banning the use chemical weapons, a recently unearthed letter shows. In a letter dated April 8, 1997, then Halliburton-CEO Cheney told Sen. Jesse Helms
    Jesse Helms
    Jesse Alexander Helms, Jr. was a five-term Republican United States Senator from North Carolina who served as chairman of the Senate Foreign Relations Committee from 1995 to 2001...

    , the chairman of the Senate Foreign Relations Committee, that it would be a mistake for America to join the Convention. "Those nations most likely to comply with the Chemical Weapons Convention
    Chemical Weapons Convention
    The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

     are not likely to ever constitute a military threat to the United States. The governments we should be concerned about are likely to cheat on the CWC, even if they do participate," reads the letter, published by the Federation of American Scientists
    Federation of American Scientists
    The Federation of American Scientists is a nonpartisan, 501 organization intent on using science and scientific analysis to attempt make the world more secure. FAS was founded in 1945 by scientists who worked on the Manhattan Project to develop the first atomic bombs...

    .

    The CWC was ratified by the Senate that same month. Since then, Albania, Libya, Russia, the United States, and India have declared over 71,000 metric tons of chemical weapon stockpiles, and destroyed about a third of them. Under the terms of the agreement, the United States and Russia are supposed to eliminate the rest of their supplies of chemical weapons by 2012. But that looks unlikely– the U.S. government estimates remaining stocks will be destroyed by 2017.

    Ancient to medieval times

    Chemical weapons have been used for millennia in the form of poisoned spears and arrows
    Archery
    Archery is the art, practice, or skill of propelling arrows with the use of a bow, from Latin arcus. Archery has historically been used for hunting and combat; in modern times, however, its main use is that of a recreational activity...

    , but evidence can be found for the existence of more advanced forms of chemical weapons in ancient and classical times.

    A good example of early chemical warfare was the late Stone Age
    Stone Age
    The Stone Age is a broad prehistoric period, lasting about 2.5 million years , during which humans and their predecessor species in the genus Homo, as well as the earlier partly contemporary genera Australopithecus and Paranthropus, widely used exclusively stone as their hard material in the...

     (10 000 BC) hunter-gatherer
    Hunter-gatherer
    A hunter-gatherer or forage society is one in which most or all food is obtained from wild plants and animals, in contrast to agricultural societies which rely mainly on domesticated species. Hunting and gathering was the ancestral subsistence mode of Homo, and all modern humans were...

     societies in Southern Africa
    Africa
    Africa is the world's second largest and second most populous continent, after Asia. At about 30.2 million km² including adjacent islands, it covers 6% of the Earth's total surface area and 20.4% of the total land area...

    , known as the San
    Bushmen
    The indigenous people of Southern Africa, whose territory spans most areas of South Africa, Zimbabwe, Lesotho, Mozambique, Swaziland, Botswana, Namibia, and Angola, are variously referred to as Bushmen, San, Sho, Barwa, Kung, or Khwe...

    . They used poisoned arrows, tipping the wood, bone and stone tips of their arrows with poisons obtained from their natural environment. These poisons were mainly derived from scorpion
    Scorpion
    Scorpions are predatory arthropod animals of the order Scorpiones within the class Arachnida. They have eight legs and are easily recognized by the pair of grasping claws and the narrow, segmented tail, often carried in a characteristic forward curve over the back, ending with a venomous stinger...

     or snake
    Snake
    Snakes are elongate, legless, carnivorous reptiles of the suborder Serpentes that can be distinguished from legless lizards by their lack of eyelids and external ears. Like all squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales...

     venom, but it is believed that some poisonous plants were also utilized. The arrow was fired into the target of choice, usually an antelope
    Antelope
    Antelope is a term referring to many even-toed ungulate species indigenous to various regions in Africa and Eurasia. Antelopes comprise a miscellaneous group within the family Bovidae, encompassing those old-world species that are neither cattle, sheep, buffalo, bison, nor goats...

     (the favourite being an eland), with the hunter then tracking the doomed animal until the poison caused its collapse.

    Ancient Greek myths about Hercules poisoning his arrows with the venom of the Hydra Monster are the earliest references to toxic weapons in western literature. Homer's epics, the Iliad and the Odyssey, allude to poisoned arrows used by both sides in the legendary Trojan War (Bronze Age Greece).

    Textual and Literary Evidence

    Some of the earliest surviving references to toxic warfare appear in the India
    India
    India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

    n epics Ramayana
    Ramayana
    The Ramayana is an ancient Sanskrit epic. It is ascribed to the Hindu sage Valmiki and forms an important part of the Hindu canon , considered to be itihāsa. The Ramayana is one of the two great epics of India and Nepal, the other being the Mahabharata...

    and Mahabharata
    Mahabharata
    The Mahabharata is one of the two major Sanskrit epics of ancient India and Nepal, the other being the Ramayana. The epic is part of itihasa....

    .


    The "Laws of Manu," a Hindu treatise on statecraft (c. 400 BC) forbids the use of poison and fire arrows, but advises poisoning food and water. Kautilya's "Arthashastra
    Arthashastra
    The Arthashastra is an ancient Indian treatise on statecraft, economic policy and military strategy which identifies its author by the names Kautilya and , who are traditionally identified with The Arthashastra (IAST: Arthaśāstra) is an ancient Indian treatise on statecraft, economic policy and...

    ," a statecraft manual of the same era, contains hundreds of recipes for creating poison weapons, toxic smokes, and other chemical weapons. Ancient Greek historians recount that Alexander the Great encountered poison arrows and fire incendiaries in India at Indus Basin in the 4th century BC.

    Sun Tzu's
    Sun Tzu
    Sun Wu , style name Changqing , better known as Sun Tzu or Sunzi , was an ancient Chinese military general, strategist and philosopher who is traditionally believed, and who is most likely, to have authored The Art of War, an influential ancient Chinese book on military strategy...

     "Art of War
    The Art of War
    The Art of War is an ancient Chinese military treatise that is attributed to Sun Tzu , a high ranking military general and strategist during the late Spring and Autumn period...

    " (c. 500 BC) advises the use of fire weapons. In the 4th century BC, writings of the Mohist sect in China
    China
    Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

     describe the use of bellows to pump smoke from burning balls of mustard
    Mustard plant
    Mustards are several plant species in the genera Brassica and Sinapis whose small mustard seeds are used as a spice and, by grinding and mixing them with water, vinegar or other liquids, are turned into the condiment known as mustard or prepared mustard...

     and other toxic vegetables into tunnels being dug by a besieging army. Even older Chinese writings dating back to about 1000 BC contain hundreds of recipes for the production of poisonous or irritating smokes for use in war along with numerous accounts of their use. From these accounts we know of the arsenic
    Arsenic
    Arsenic is a chemical element with the symbol As, atomic number 33 and relative atomic mass 74.92. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. It was first documented by Albertus Magnus in 1250.Arsenic is a metalloid...

    -containing "soul-hunting fog", and the use of finely divided lime dispersed into the air to suppress a peasant revolt in AD 178
    178
    Year 178 was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Scipio and Rufus...

    .

    The earliest recorded use of gas warfare in the West dates back to the 5th century BC, during the Peloponnesian War
    Peloponnesian War
    The Peloponnesian War, 431 to 404 BC, was an ancient Greek war fought by Athens and its empire against the Peloponnesian League led by Sparta. Historians have traditionally divided the war into three phases...

     between Athens
    Athens
    Athens , is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, as its recorded history spans around 3,400 years. Classical Athens was a powerful city-state...

     and Sparta
    Sparta
    Sparta or Lacedaemon, was a prominent city-state in ancient Greece, situated on the banks of the River Eurotas in Laconia, in south-eastern Peloponnese. It emerged as a political entity around the 10th century BC, when the invading Dorians subjugated the local, non-Dorian population. From c...

    . Spartan forces besieging an Athenian city placed a lighted mixture of wood, pitch, and sulfur under the walls hoping that the noxious smoke would incapacitate the Athenians, so that they would not be able to resist the assault that followed. Sparta was not alone in its use of unconventional tactics in ancient Greece: Solon
    Solon
    Solon was an Athenian statesman, lawmaker, and poet. He is remembered particularly for his efforts to legislate against political, economic and moral decline in archaic Athens...

     of Athens is said to have used hellebore
    Hellebore
    Commonly known as hellebores, members of the genus Helleborus comprise approximately 20 species of herbaceous perennial flowering plants in the family Ranunculaceae, within which it gave its name to the tribe of Helleboreae...

     roots to poison the water in an aqueduct leading from the River Pleistos
    River Pleistos
    The River Pleistos is a Greek river that starts at Mount Parnassos and flows south to the Corinthian Gulf. Its neighbors include Kephisos to the north and Euenos to the west....

     around 590 BC during the siege of Kirrha.

    Polish chronicler Jan Długosz mentions usage of poisonous gas by the Mongol army in 1241 in the Battle of Legnica
    Battle of Legnica
    The Battle of Legnica , also known as the Battle of Liegnitz or Battle of Wahlstatt , was a battle between the Mongol Empire and the combined defending forces of European fighters that took place at Legnickie Pole near the city of Legnica in Silesia on 9 April 1241.A combined force of Poles,...

    . However, his report is not firsthand, as he was born in the 15th century. According to Mukhamedzhan Tynyshpaev, Długosz's chronicle is unclear as to what kind of device or gas was used, giving only a description of a noxious smell. Rather, he suggests, this is a repeat of the trope of the Mongols' bad smell as an excuse for their annihilation of European defenders.

    Historian and philosopher David Hume
    David Hume
    David Hume was a Scottish philosopher, historian, economist, and essayist, known especially for his philosophical empiricism and skepticism. He was one of the most important figures in the history of Western philosophy and the Scottish Enlightenment...

    , in his history of England, recounts how in the reign of Henry III
    Henry III of England
    Henry III was the son and successor of John as King of England, reigning for 56 years from 1216 until his death. His contemporaries knew him as Henry of Winchester. He was the first child king in England since the reign of Æthelred the Unready...

     (r.1216 - 1272) the English Navy destroyed an invading French fleet, by blinding the enemy fleet with "quicklime," the old name for calcium oxide
    Calcium oxide
    Calcium oxide , commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline crystalline solid at room temperature....

    . D’Albiney employed a stratagem against them, which is said to have contributed to the victory: Having gained the wind of the French, he came down upon them with violence; and throwing in their faces a great quantity of quicklime, which he purposely carried on board, he so blinded them, that they were disabled from defending themselves.

    Archaeological Evidence

    There is archaeological
    Archaeological science
    Archaeological science, also known as archaeometry, consists of the application of scientific techniques to the analysis of archaeological materials. Archaeometry is now considered its own scientific field. The UK's Natural and Environmental Research Council provides funding for archaeometry...

     evidence that the Sasanians deployed chemical weapons against the Roman army in 3rd century AD/CE. Research carried out on the collapsed tunnels at Dura-Europos
    Dura-Europos
    Dura-Europos , also spelled Dura-Europus, was a Hellenistic, Parthian and Roman border city built on an escarpment 90 m above the right bank of the Euphrates river. It is located near the village of Salhiyé, in today's Syria....

     in Syria suggests that the Iranians used bitumen and sulfur
    Sulfur
    Sulfur or sulphur is the chemical element with atomic number 16. In the periodic table it is represented by the symbol S. It is an abundant, multivalent non-metal. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a bright yellow...

     crystals to get it burning. When ignited, the materials gave off dense clouds of choking gases which killed 20 Roman soldiers in the matter of 2 minutes.

    Rediscovery

    During the Renaissance
    Renaissance
    The Renaissance was a cultural movement that spanned roughly the 14th to the 17th century, beginning in Italy in the Late Middle Ages and later spreading to the rest of Europe. The term is also used more loosely to refer to the historical era, but since the changes of the Renaissance were not...

    , people again considered using chemical warfare. One of the earliest such references is from Leonardo da Vinci
    Leonardo da Vinci
    Leonardo di ser Piero da Vinci was an Italian Renaissance polymath: painter, sculptor, architect, musician, scientist, mathematician, engineer, inventor, anatomist, geologist, cartographer, botanist and writer whose genius, perhaps more than that of any other figure, epitomized the Renaissance...

    , who proposed a powder of sulfide of arsenic and verdigris
    Verdigris
    Verdigris is the common name for a green pigment obtained through the application of acetic acid to copper plates or the natural patina formed when copper, brass or bronze is weathered and exposed to air or seawater over a period of time. It is usually a basic copper carbonate, but near the sea...

     in the 15th century:
    throw poison in the form of powder upon galleys. Chalk, fine sulfide of arsenic, and powdered verdegris may be thrown among enemy ships by means of small mangonel
    Mangonel
    A mangonel was a type of catapult or siege engine used in the medieval period to throw projectiles at a castle's walls. The exact meaning of the term is debatable, and several possibilities have been suggested. Mangonel may also be indirectly referring to the 'mangon' a French hard stone found in...

    s, and all those who, as they breathe, inhale the powder into their lungs will become asphyxiated.

    It is unknown whether this powder was ever actually used.

    In the late 15th century, Spanish conquistadors encountered a rudimentary type of chemical warfare on the island of Hispaniola
    Hispaniola
    Hispaniola is a major island in the Caribbean, containing the two sovereign states of the Dominican Republic and Haiti. The island is located between the islands of Cuba to the west and Puerto Rico to the east, within the hurricane belt...

    . The Taíno
    Taíno people
    The Taínos were pre-Columbian inhabitants of the Bahamas, Greater Antilles, and the northern Lesser Antilles. It is thought that the seafaring Taínos are relatives of the Arawak people of South America...

     threw gourds filled with ashes and ground hot peppers at the Spaniards to create a blinding smoke screen before launching their attack.

    In the 17th century during siege
    Siege
    A siege is a military blockade of a city or fortress with the intent of conquering by attrition or assault. The term derives from sedere, Latin for "to sit". Generally speaking, siege warfare is a form of constant, low intensity conflict characterized by one party holding a strong, static...

    s, armies attempted to start fires by launching incendiary
    Incendiary device
    Incendiary weapons, incendiary devices or incendiary bombs are bombs designed to start fires or destroy sensitive equipment using materials such as napalm, thermite, chlorine trifluoride, or white phosphorus....

     shells
    Artillery
    Originally applied to any group of infantry primarily armed with projectile weapons, artillery has over time become limited in meaning to refer only to those engines of war that operate by projection of munitions far beyond the range of effect of personal weapons...

     filled with sulfur
    Sulfur
    Sulfur or sulphur is the chemical element with atomic number 16. In the periodic table it is represented by the symbol S. It is an abundant, multivalent non-metal. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a bright yellow...

    , tallow
    Tallow
    Tallow is a rendered form of beef or mutton fat, processed from suet. It is solid at room temperature. Unlike suet, tallow can be stored for extended periods without the need for refrigeration to prevent decomposition, provided it is kept in an airtight container to prevent oxidation.In industry,...

    , rosin
    Rosin
    .Rosin, also called colophony or Greek pitch , is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by heating fresh liquid resin to vaporize the volatile liquid terpene components. It is semi-transparent and varies in color from yellow to black...

    , turpentine
    Turpentine
    Turpentine is a fluid obtained by the distillation of resin obtained from trees, mainly pine trees. It is composed of terpenes, mainly the monoterpenes alpha-pinene and beta-pinene...

    , saltpeter
    Potassium nitrate
    Potassium nitrate is a chemical compound with the formula KNO3. It is an ionic salt of potassium ions K+ and nitrate ions NO3−.It occurs as a mineral niter and is a natural solid source of nitrogen. Its common names include saltpetre , from medieval Latin sal petræ: "stone salt" or possibly "Salt...

    , and/or antimony
    Antimony
    Antimony is a toxic chemical element with the symbol Sb and an atomic number of 51. A lustrous grey metalloid, it is found in nature mainly as the sulfide mineral stibnite...

    . Even when fires were not started, the resulting smoke and fumes provided a considerable distraction. Although their primary function was never abandoned, a variety of fills for shells were developed to maximize the effects of the smoke.

    In 1672, during his siege of the city of Groningen, Christoph Bernhard van Galen, the Bishop of Münster, employed several different explosive and incendiary devices, some of which had a fill that included Deadly Nightshade, intended to produce toxic fumes. Just three years later, August 27, 1675, the French
    France
    The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

     and the Germans
    Germany
    Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

     concluded the Strasbourg Agreement
    Strasbourg Agreement (1675)
    The Strasbourg Agreement of 1675 is the first international agreement banning the use of chemical weapons. The treaty was signed between France and the Holy Roman Empire, and was created in response to the use of poisoned bullets. The treaty was signed on August 27, 1675...

    , which included an article banning the use of "perfidious and odious" toxic devices.

    In June 1845, British troops attacking Maori trenches and bunkers at Ohaeawai
    Ohaeawai
    Ohaeawai is a small village at the junction of State Highway 1 and State Highway 12 in the Far North District of New Zealand, some 250 km from Auckland. Nearby is the site of the bloody Battle of Ohaeawai fought at Pene Taui's pā during the Flagstaff War in 1845...

     in New Zealand
    New Zealand
    New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

     fired shells containing an unknown type of poison gas from their cannon and mortars. The Maori withstood the bombardment and won the battle.

    In 1854, Lyon Playfair, a British
    United Kingdom
    The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

     chemist, proposed a cacodyl cyanide
    Blood agent
    A blood agent is a toxic chemical agent that affects the body by being absorbed into the blood. They are fast-acting, potentially lethal poisons that typically manifest at room temperature as volatile colorless gases with a faint odor. Blood agents are either cyanide- or...

     artillery shell for use against enemy ships as way to solve the stalemate during the siege of Sevastopol
    Sevastopol
    Sevastopol is a city on rights of administrative division of Ukraine, located on the Black Sea coast of the Crimea peninsula. It has a population of 342,451 . Sevastopol is the second largest port in Ukraine, after the Port of Odessa....

    . The proposal was backed by Admiral Thomas Cochrane
    Thomas Cochrane, 10th Earl of Dundonald
    Admiral Thomas Cochrane, 10th Earl of Dundonald, 1st Marquess of Maranhão, GCB, ODM , styled Lord Cochrane between 1778 and 1831, was a senior British naval flag officer and radical politician....

     of the Royal Navy
    Royal Navy
    The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

    . It was considered by the Prime Minister, Lord Palmerston, but the British Ordnance Department rejected the proposal as "as bad a mode of warfare as poisoning the wells of the enemy." Playfair’s response was used to justify chemical warfare into the next century:
    There was no sense in this objection. It is considered a legitimate mode of warfare to fill shells with molten metal which scatters among the enemy, and produced the most frightful modes of death. Why a poisonous vapor which would kill men without suffering is to be considered illegitimate warfare is incomprehensible. War is destruction, and the more destructive it can be made with the least suffering the sooner will be ended that barbarous method of protecting national rights. No doubt in time chemistry will be used to lessen the suffering of combatants, and even of criminals condemned to death.


    Later, during the American Civil War
    American Civil War
    The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

    , New York
    New York
    New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...

     school teacher John Doughty proposed the offensive use of chlorine
    Chlorine
    Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine...

     gas, delivered by filling a 10 inch
    Inch
    An inch is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. There are 36 inches in a yard and 12 inches in a foot...

     (254 millimeter) artillery shell with 2 to 3 quart
    Quart
    The quart is a unit of volume equal to a quarter of a gallon, two pints, or four cups. Since gallons of various sizes have historically been in use, quarts of various sizes have also existed; see gallon for further discussion. Three of these kinds of quarts remain in current use, all approximately...

    s (2 to 3 liter
    Litér
    - External links :*...

    s) of liquid chlorine, which could produce many cubic feet (a few cubic meters) of chlorine gas. Doughty’s plan was apparently never acted on, as it was probably presented to Brigadier General James Wolfe Ripley
    James Wolfe Ripley
    James Wolfe Ripley was an American soldier, serving as a brigadier general in the Union Army during the Civil War. He was instrumental in the early days of the war in modernizing the artillery's ordnance. However, Ripley also delayed the introduction of repeating rifles into U.S...

    , Chief of Ordnance, who was described as being congenitally immune to new ideas.

    A general concern over the use of poison gas manifested itself in 1899 at the Hague Conference
    Hague Conventions (1899 and 1907)
    The Hague Conventions were two international treaties negotiated at international peace conferences at The Hague in the Netherlands: The First Hague Conference in 1899 and the Second Hague Conference in 1907...

     with a proposal prohibiting shells filled with asphyxiating gas. The proposal was passed, despite a single dissenting vote from the United States. The American representative, Navy Captain Alfred Thayer Mahan
    Alfred Thayer Mahan
    Alfred Thayer Mahan was a United States Navy flag officer, geostrategist, and historian, who has been called "the most important American strategist of the nineteenth century." His concept of "sea power" was based on the idea that countries with greater naval power will have greater worldwide...

    , justified voting against the measure on the grounds that "the inventiveness of Americans should not be restricted in the development of new weapons."

    World War I

    The Hague Declaration of 1899 and the Hague Convention of 1907 forbade the use of "poison or poisonous weapons" in warfare, yet more than 124,000 tons of gas were produced by the end of World War I. The French were the first to use chemical weapons during the First World War, using tear gas.

    The Germans' first use of chemical weapons were shells containing xylyl bromide
    Xylyl bromide
    Xylyl bromide, also known as methylbenzyl bromide or T-stoff, is a poisonous organic chemical compound with the formula C8H9Br, formerly used as a tear gas...

     that were fired at the Russians near the town of Bolimów
    Bolimów
    Bolimów is a village in Skierniewice County, Łódź Voivodeship, in central Poland. It is the seat of the Gmina called Gmina Bolimów. It lies approximately north of Skierniewice and north-east of the regional capital Łódź. The village has a population of 930...

    , Poland in January 1915. The first full-scale deployment of chemical warfare agents was during World War I, originating in the Second Battle of Ypres
    Second Battle of Ypres
    The Second Battle of Ypres was the first time Germany used poison gas on a large scale on the Western Front in the First World War and the first time a former colonial force pushed back a major European power on European soil, which occurred in the battle of St...

    , April 22, 1915, when the Germans attacked French, Canadian
    Canada
    Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

     and Algeria
    Algeria
    Algeria , officially the People's Democratic Republic of Algeria , also formally referred to as the Democratic and Popular Republic of Algeria, is a country in the Maghreb region of Northwest Africa with Algiers as its capital.In terms of land area, it is the largest country in Africa and the Arab...

    n troops with chlorine gas. Deaths were light, though casualties relatively heavy.

    A total 50,965 tons of pulmonary, lachrymatory, and vesicant agents were deployed by both sides of the conflict, including chlorine
    Chlorine
    Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine...

    , phosgene
    Phosgene
    Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...

     and mustard gas. Official figures declare about 1,176,500 non-fatal casualties and 85,000 fatalities directly caused by chemical warfare agents during the course of the war.

    To this day unexploded World War I-era chemical ammunition is still uncovered when the ground is dug in former battle or depot areas and continues to pose a threat to the civilian population in Belgium
    Belgium
    Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...

     and France and less commonly in other countries. The French and Belgian governments have had to launch special programs for treating discovered ammunition.

    After the war, most of the unused German chemical warfare agents were dumped into the Baltic Sea
    Baltic Sea
    The Baltic Sea is a brackish mediterranean sea located in Northern Europe, from 53°N to 66°N latitude and from 20°E to 26°E longitude. It is bounded by the Scandinavian Peninsula, the mainland of Europe, and the Danish islands. It drains into the Kattegat by way of the Øresund, the Great Belt and...

    , a common disposal method among all the participants in several bodies of water. Over time, the salt water causes the shell casings to corrode, and mustard gas occasionally leaks from these containers and washes onto shore as a wax-like solid resembling ambergris
    Ambergris
    Ambergris is a solid, waxy, flammable substance of a dull gray or blackish color produced in the digestive system of and regurgitated or secreted by sperm whales....

    . Even in this solidified form, the agent is active enough to cause severe burns to anybody coming into contact with it.

    Interwar years

    After World War I chemical agents were occasionally used to subdue populations and suppress rebellion.

    Following the defeat of the Ottoman Empire
    Ottoman Empire
    The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

     in 1917, the Ottoman government collapsed completely, and the former empire was divided amongst the victorious powers in the Treaty of Sèvres
    Treaty of Sèvres
    The Treaty of Sèvres was the peace treaty between the Ottoman Empire and Allies at the end of World War I. The Treaty of Versailles was signed with Germany before this treaty to annul the German concessions including the economic rights and enterprises. Also, France, Great Britain and Italy...

    . The British
    United Kingdom
    The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

     occupied Mesopotamia
    Mesopotamia
    Mesopotamia is a toponym for the area of the Tigris–Euphrates river system, largely corresponding to modern-day Iraq, northeastern Syria, southeastern Turkey and southwestern Iran.Widely considered to be the cradle of civilization, Bronze Age Mesopotamia included Sumer and the...

     (present-day Iraq
    Iraq
    Iraq ; officially the Republic of Iraq is a country in Western Asia spanning most of the northwestern end of the Zagros mountain range, the eastern part of the Syrian Desert and the northern part of the Arabian Desert....

    ) and established a colonial government
    Colonialism
    Colonialism is the establishment, maintenance, acquisition and expansion of colonies in one territory by people from another territory. It is a process whereby the metropole claims sovereignty over the colony and the social structure, government, and economics of the colony are changed by...

    .

    In 1920, the Arab
    Arab
    Arab people, also known as Arabs , are a panethnicity primarily living in the Arab world, which is located in Western Asia and North Africa. They are identified as such on one or more of genealogical, linguistic, or cultural grounds, with tribal affiliations, and intra-tribal relationships playing...

     and Kurd
    Kürd
    Kürd or Kyurd or Kyurt may refer to:*Kürd Eldarbəyli, Azerbaijan*Kürd Mahrızlı, Azerbaijan*Kürd, Goychay, Azerbaijan*Kürd, Jalilabad, Azerbaijan*Kürd, Qabala, Azerbaijan*Qurdbayram, Azerbaijan...

    ish people of Mesopotamia
    Mesopotamia
    Mesopotamia is a toponym for the area of the Tigris–Euphrates river system, largely corresponding to modern-day Iraq, northeastern Syria, southeastern Turkey and southwestern Iran.Widely considered to be the cradle of civilization, Bronze Age Mesopotamia included Sumer and the...

     revolted
    Iraqi revolt against the British
    The Iraqi Revolt against the British , or the Great Iraqi Revolution of 1920, started in Baghdad in the summer of 1920 with mass demonstrations of both Sunni and Shia, including protests by embittered officers from the old Ottoman army, against the policies of British Acting Civil Commissioner Sir...

     against the British occupation, which cost the British dearly. As the Mesopotamian resistance gained strength, the British resorted to increasingly repressive measures. Much speculation was made about aerial bombardment
    Aerial bombing of cities
    A species of strategic bombing, the aerial bombing of cities began in 1915 during World War I, grew to a vast scale in World War II, and continues to the present day. The development of aerial bombardment marked an increased capacity of armed forces to deliver explosive weapons in populated areas...

     of major cities with gas in Mesopotamia
    Gas in Mesopotamia
    It has been claimed that the British used toxic gas against the Kurds in Mesopotamia, during the Ath Thawra al Iraqiyya al Kubra or Iraqi revolt against the British in 1920, in the period of the British Mandate of Mesopotamia...

    , with Winston Churchill
    Winston Churchill
    Sir Winston Leonard Spencer-Churchill, was a predominantly Conservative British politician and statesman known for his leadership of the United Kingdom during the Second World War. He is widely regarded as one of the greatest wartime leaders of the century and served as Prime Minister twice...

    , then-Secretary of State at the British War Office, arguing in favor of it.

    In 1925, sixteen of the world's major nations signed the Geneva Protocol
    Geneva Protocol
    The Protocol for the Prohibition of the Use in War of Asphyxiating, Poisonous or other Gases, and of Bacteriological Methods of Warfare, usually called the Geneva Protocol, is a treaty prohibiting the first use of chemical and biological weapons. It was signed at Geneva on June 17, 1925 and entered...

    , thereby pledging never to use gas in warfare again. Notably, in the United States
    United States
    The United States of America is a federal constitutional republic comprising fifty states and a federal district...

    , the Protocol languished in the Senate
    United States Senate
    The United States Senate is the upper house of the bicameral legislature of the United States, and together with the United States House of Representatives comprises the United States Congress. The composition and powers of the Senate are established in Article One of the U.S. Constitution. Each...

     until 1975, when it was finally ratified.

    The Bolsheviks also employed poison gas in 1921 during the Tambov Rebellion
    Tambov Rebellion
    The Tambov Rebellion which occurred between 1920 and 1921 was one of the largest and best-organized peasant rebellions challenging the Bolshevik regime during the Russian Civil War. The uprising took place in the territories of the modern Tambov Oblast and part of the Voronezh Oblast, less than...

    . An order signed by military commanders
    Tukhachevsky and Vladimir Antonov-Ovseenko
    Vladimir Antonov-Ovseenko
    Vladimir Alexandrovich Antonov-Ovseyenko , real surname Ovseyenko, party aliases the 'Bayonet' and 'Nikita' , a literary pseudonym A. Gal , was a prominent Soviet Bolshevik leader and diplomat. He was born in Chernigov into an officer's family.In 1903, Antonov-Ovseyenko joined the Menshevik party...

     stipulated: "The forests where the bandits are hiding are to be cleared by the use of poison gas. This must be carefully calculated, so that the layer of gas penetrates the forests and kills everyone hiding there."

    During the Rif War
    Rif War (1920)
    The Rif War, also called the Second Moroccan War, was fought between Spain and the Moroccan Rif Berbers.-Rifian forces:...

     in Spanish Morocco
    Spanish Morocco
    The Spanish protectorate of Morocco was the area of Morocco under colonial rule by the Spanish Empire, established by the Treaty of Fez in 1912 and ending in 1956, when both France and Spain recognized Moroccan independence.-Territorial borders:...

     in 1921–1927, combined Spanish
    Spain
    Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

     and French
    France
    The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

     forces dropped mustard gas bombs in an attempt to put down the Berber
    Berber people
    Berbers are the indigenous peoples of North Africa west of the Nile Valley. They are continuously distributed from the Atlantic to the Siwa oasis, in Egypt, and from the Mediterranean to the Niger River. Historically they spoke the Berber language or varieties of it, which together form a branch...

     rebellion. (See also: Chemical weapons in the Rif War
    Chemical weapons in the Rif War
    During the Third Rif War in Spanish Morocco between 1921 and 1927, the Spanish Army of Africa dropped chemical warfare agents in an attempt to put down the Riffian Berber rebellion led by guerrilla leader Abd el-Krim....

    )

    In 1935, Fascist
    Fascism
    Fascism is a radical authoritarian nationalist political ideology. Fascists seek to rejuvenate their nation based on commitment to the national community as an organic entity, in which individuals are bound together in national identity by suprapersonal connections of ancestry, culture, and blood...

     Italy
    Italy
    Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

     used mustard gas during the invasion of Ethiopia
    Ethiopia
    Ethiopia , officially known as the Federal Democratic Republic of Ethiopia, is a country located in the Horn of Africa. It is the second-most populous nation in Africa, with over 82 million inhabitants, and the tenth-largest by area, occupying 1,100,000 km2...

     in the Second Italo-Abyssinian War
    Second Italo-Abyssinian War
    The Second Italo–Abyssinian War was a colonial war that started in October 1935 and ended in May 1936. The war was fought between the armed forces of the Kingdom of Italy and the armed forces of the Ethiopian Empire...

    . Ignoring the Geneva Protocol
    Geneva Protocol
    The Protocol for the Prohibition of the Use in War of Asphyxiating, Poisonous or other Gases, and of Bacteriological Methods of Warfare, usually called the Geneva Protocol, is a treaty prohibiting the first use of chemical and biological weapons. It was signed at Geneva on June 17, 1925 and entered...

    , which it signed seven years earlier, the Italian military
    Military of Italy
    The Italian armed forces are the military of Italy, they are under the command of the Italian Supreme Council of Defence, presided over by the President of the Italian Republic. The total number of active military personnel is 293,202...

     dropped mustard gas in bombs, sprayed it from airplanes, and spread it in powdered form on the ground. 150,000 chemical casualties were reported, mostly from mustard gas.

    World War II

    Despite article 171 of the Versailles Peace Treaty, article V of the Treaty in Relation to the Use of Submarines and Noxious Gases in Warfare and a resolution adopted against Japan by the League of Nations
    League of Nations
    The League of Nations was an intergovernmental organization founded as a result of the Paris Peace Conference that ended the First World War. It was the first permanent international organization whose principal mission was to maintain world peace...

     on 14 May 1938, the Imperial Japanese Army
    Imperial Japanese Army
    -Foundation:During the Meiji Restoration, the military forces loyal to the Emperor were samurai drawn primarily from the loyalist feudal domains of Satsuma and Chōshū...

     frequently used chemical weapons. Because of fear of retaliation however, those weapons were never used against Westerners, but against other Asians judged "inferior" by the imperial propaganda.

    According to historians Yoshiaki Yoshimi
    Yoshiaki Yoshimi
    is a professor of Japanese modern history at Chuo University in Tokyo, Japan. Yoshimi is a founder member of the Center for Research and Documentation on Japan's war responsibility...

     and Kentaro Awaya, gas weapons, such as tear gas, were used only sporadically in 1937 but in the spring of 1938, however the Imperial Japanese Army
    Imperial Japanese Army
    -Foundation:During the Meiji Restoration, the military forces loyal to the Emperor were samurai drawn primarily from the loyalist feudal domains of Satsuma and Chōshū...

     began full-scale use of sneeze and nausea gas (red), and from summer 1939, mustard gas (yellow) was used against both Kuomintang and Communists Chinese troops.

    According to historians Yoshiaki Yoshimi
    Yoshiaki Yoshimi
    is a professor of Japanese modern history at Chuo University in Tokyo, Japan. Yoshimi is a founder member of the Center for Research and Documentation on Japan's war responsibility...

     and Seiya Matsuno, the chemical weapons were authorized by specific orders given by Emperor Showa himself, transmitted by the chief of staff of the army
    Imperial General Headquarters
    The as part of the Supreme War Council was established in 1893 to coordinate efforts between the Imperial Japanese Army and Imperial Japanese Navy during wartime...

    . For example, the Emperor authorized the use of toxic gas on 375 separate occasions during the Battle of Wuhan
    Battle of Wuhan
    The Battle of Wuhan, popularly known to the Chinese as the Defence of Wuhan, and to the Japanese as the Capture of Wuhan, was a large-scale battle of the Second Sino-Japanese War...

     from August to October 1938.

    They were also profusely used during the invasion of Changde. Those orders were transmitted either by prince Kotohito Kan'in or general Hajime Sugiyama.

    The Imperial Japanese Army
    Imperial Japanese Army
    -Foundation:During the Meiji Restoration, the military forces loyal to the Emperor were samurai drawn primarily from the loyalist feudal domains of Satsuma and Chōshū...

     used mustard gas and the recently-developed blister agent
    Blister agent
    A blister agent, or vesicant, is a chemical compound that causes severe skin, eye and mucosal pain and irritation. They are named for their ability to cause severe chemical burns, resulting in painful water blisters on the bodies of those affected...

     Lewisite
    Lewisite
    Lewisite is an organoarsenic compound, specifically an arsine. It was once manufactured in the U.S. and Japan as a chemical weapon, acting as a vesicant and lung irritant...

     against Chinese
    China
    Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

     troops and guerrillas. Experiments involving chemical weapons were conducted on live prisoners (Unit 731
    Unit 731
    was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that undertook lethal human experimentation during the Second Sino-Japanese War and World War II. It was responsible for some of the most notorious war crimes carried out by Japanese...

     and Unit 516
    Unit 516
    Unit 516 was a top secret Japanese chemical weapons facility, operated by the Kempeitai, in Qiqihar, Manchukuo. The name Unit 516 was a code name of the Unit....

    ). The Japanese also carried chemical weapons as they swept through Southeast Asia
    Southeast Asia
    Southeast Asia, South-East Asia, South East Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia. The region lies on the intersection of geological plates, with heavy seismic...

     towards Australia.

    Some of these items were captured and analyzed by the Allies. Greatly concerned, Australia covertly imported 1,000,000 chemical weapons from the United Kingdom from 1942 onwards http://www.mustardgas.org
    http://www.news.com.au/dailytelegraph/story/0,22049,23458220-5015730,00.html.

    Shortly after the end of World War I
    World War I
    World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

    , Germany's General Staff enthusiastically pursued a recapture of their preeminent position in chemical warfare. In 1923, Hans von Seeckt
    Hans von Seeckt
    Johannes Friedrich "Hans" von Seeckt was a German military officer noted for his organization of the German Army during the Weimar Republic.-Early life:...

     pointed the way, by suggesting that German poison gas research move in the direction of delivery by aircraft in support of mobile warfare. Also in 1923, at the behest of the German army
    Reichswehr
    The Reichswehr formed the military organisation of Germany from 1919 until 1935, when it was renamed the Wehrmacht ....

    , poison gas expert Dr. Hugo Stolzenberg negotiated with the USSR to build a huge chemical weapons plant at Trotsk, on the Volga river.

    Collaboration between Germany and the USSR in poison gas continued on and off through the 1920s. In 1924, German officers debated the use of poison gas versus non-lethal chemical weapons against civilians. Even before World War II
    World War II
    World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

    , chemical warfare was revolutionized by Nazi Germany
    Nazi Germany
    Nazi Germany , also known as the Third Reich , but officially called German Reich from 1933 to 1943 and Greater German Reich from 26 June 1943 onward, is the name commonly used to refer to the state of Germany from 1933 to 1945, when it was a totalitarian dictatorship ruled by...

    's discovery of the nerve agent
    Nerve agent
    Nerve agents are a class of phosphorus-containing organic chemicals that disrupt the mechanism by which nerves transfer messages to organs...

    s tabun (in 1937) and sarin
    Sarin
    Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...

     (in 1939) by Gerhard Schrader
    Gerhard Schrader
    Dr. Gerhard Schrader was a German chemist specializing in the discovery of new insecticides, hoping to make progress in the fight against hunger in the world. However, Dr...

    , a chemist of IG Farben
    IG Farben
    I.G. Farbenindustrie AG was a German chemical industry conglomerate. Its name is taken from Interessen-Gemeinschaft Farbenindustrie AG . The company was formed in 1925 from a number of major companies that had been working together closely since World War I...

    .

    IG Farben was Germany's premier poison gas manufacturer during World War I
    World War I
    World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

    , so the weaponization of these agents can not be considered accidental. Both were turned over to the German Army Weapons Office prior to the outbreak of the war.

    The nerve agent soman
    Soman
    Soman, or GD , is an extremely toxic chemical substance. It is a nerve agent, interfering with normal functioning of the mammalian nervous system by inhibiting the cholinesterase enzyme. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations according to UN...

     was later discovered by Nobel Prize laureate Richard Kuhn
    Richard Kuhn
    Richard Kuhn was an Austrian-German biochemist, Nobel laureate, and Nazi collaborator.-Early life:Kuhn was born in Vienna, Austria where he attended grammar school and high school. His interest in chemistry surfaced early; however he had many interests and decided late to study chemistry...

     and his collaborator Konrad Henkel at the Kaiser Wilhelm Institute for Medical Research in Heidelberg in spring of 1944. The Nazis developed and manufactured large quantities of several agents, but chemical warfare was not extensively used by either side. Chemical troops were set up (in Germany since 1934) and delivery technology was actively developed.

    Recovered Nazi documents suggest that German intelligence
    Abwehr
    The Abwehr was a German military intelligence organisation from 1921 to 1944. The term Abwehr was used as a concession to Allied demands that Germany's post-World War I intelligence activities be for "defensive" purposes only...

     incorrectly thought that the Allies
    Allies of World War II
    The Allies of World War II were the countries that opposed the Axis powers during the Second World War . Former Axis states contributing to the Allied victory are not considered Allied states...

     also knew of these compounds, interpreting their lack of mention in the Allies' scientific journals as evidence that information about them was being suppressed. Germany ultimately decided not to use the new nerve agents, fearing a potentially devastating Allied retaliatory nerve agent deployment.

    William L. Shirer
    William L. Shirer
    William Lawrence Shirer was an American journalist, war correspondent, and historian, who wrote The Rise and Fall of the Third Reich, a history of Nazi Germany read and cited in scholarly works for more than 50 years...

    , in The Rise and Fall of the Third Reich, writes that the British high command considered the use of chemical weapons as a last-ditch defensive measure in the event of a Nazi invasion of Britain.

    On the night of December 2, 1943, German Ju 88 bombers attacked the port
    Air Raid on Bari
    The air raid on Bari was an air attack by German bombers on Allied forces and shipping in Bari, Italy on 2 December 1943 during World War II. In the attack, 105 German Junkers Ju 88 bombers of Luftflotte 2, achieving complete surprise, bombed shipping and personnel operating in support of the...

     of Bari
    Bari
    Bari is the capital city of the province of Bari and of the Apulia region, on the Adriatic Sea, in Italy. It is the second most important economic centre of mainland Southern Italy after Naples, and is well known as a port and university city, as well as the city of Saint Nicholas...

     in Southern Italy
    Italy
    Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

    , sinking several American ships– among them , which was carrying mustard gas intended for use in retaliation by the Allies if German forces initiated gas warfare. The presence of the gas was highly classified, and authorities ashore had no knowledge of it– which increased the number of fatalities, since physicians, who had no idea that they were dealing with the effects of mustard gas, prescribed treatment improper for those suffering from exposure and immersion.

    The whole affair was kept secret at the time and for many years after the war (in the opinion of some, there was a deliberate and systematic cover-up). According to the U.S. military
    Military of the United States
    The United States Armed Forces are the military forces of the United States. They consist of the Army, Navy, Marine Corps, Air Force, and Coast Guard.The United States has a strong tradition of civilian control of the military...

     account, "Sixty-nine deaths were attributed in whole or in part to the mustard gas, most of them American merchant seamen"
    out of 628 mustard gas military casualties.
    The large number of civilian casualties
    Civilian casualties
    Civilian casualties is a military term describing civilian or non-combatant persons killed, injured, or imprisoned by military action. The description of civilian casualties includes any form of military action regardless of whether civilians were targeted directly...

     among the Italian population were not recorded. Part of the confusion and controversy derives from the fact that the German attack was highly destructive and lethal in itself, also apart from the accidental additional effects of the gas (it was nicknamed "The Little Pearl Harbor"), and attribution of the causes of death between the gas and other causes is far from easy.

    Rick Atkinson
    Rick Atkinson
    Rick Atkinson is an American journalist and author whose contributions led to four Pulitzer Prizes.-Life:Atkinson was born in Munich. His father was an United States Army officer and he grew up at military posts. He earned his bachelor degree from East Carolina University in 1974 and a master of...

    , in his book The Day of Battle, describes the intelligence that prompted Allied leaders to deploy mustard gas to Italy. This included Italian intelligence that Adolf Hitler
    Adolf Hitler
    Adolf Hitler was an Austrian-born German politician and the leader of the National Socialist German Workers Party , commonly referred to as the Nazi Party). He was Chancellor of Germany from 1933 to 1945, and head of state from 1934 to 1945...

     had threatened to use gas against Italy if the state changed sides, and prisoner of war
    Prisoner of war
    A prisoner of war or enemy prisoner of war is a person, whether civilian or combatant, who is held in custody by an enemy power during or immediately after an armed conflict...

     interrogations suggesting that preparations were being made to use a "new, egregiously potent gas" if the war turned decisively against Germany. Atkinson concludes that "No commander in 1943 could be cavalier about a manifest threat by Germany to use gas."

    North Yemen

    The first attack of the North Yemen
    North Yemen
    North Yemen is a term currently used to designate the Yemen Arab Republic , its predecessor, the Mutawakkilite Kingdom of Yemen , and their predecessors that exercised sovereignty over the territory that is now the north-western part of the state of Yemen in southern Arabia.Neither state ever...

     Civil War
    North Yemen Civil War
    The North Yemen Civil War was fought in North Yemen between royalists of the Mutawakkilite Kingdom of Yemen and factions of the Yemen Arab Republic from 1962 to 1970. The war began with a coup d'état carried out by the republican leader, Abdullah as-Sallal, which dethroned the newly crowned Imam...

     took place on June 8, 1963 against Kawma, a village of about 100 inhabitants in northern Yemen, killing about seven people and damaging the eyes and lungs of twenty-five others. This incident is considered to have been experimental, and the bombs were described as "home-made, amateurish and relatively ineffective". The Egyptian authorities suggested that the reported incidents were probably caused by napalm, not gas.

    There were no reports of gas during 1964, and only a few were reported in 1965. The reports grew more frequent in late 1966. On December 11, 1966, fifteen gas bombs killed two people and injured thirty-five. On January 5, 1967, the biggest gas attack came against the village of Kitaf, causing 270 casualties, including 140 fatalities. The target may have been Prince Hassan bin Yahya, who had installed his headquarters nearby. The Egyptian government denied using poison gas, and alleged that Britain and the US were using the reports as psychological warfare against Egypt. On February 12, 1967, it said it would welcome a UN investigation. On March 1, U Thant said he was "powerless" to deal with the matter.

    On May 10, the twin villages of Gahar and Gadafa in Wadi Hirran, where Prince Mohamed bin Mohsin was in command, were gas bombed, killing at least seventy-five. The Red Cross was alerted and on June 2, it issued a statement in Geneva expressing concern. The Institute of Forensic Medicine at the University of Berne made a statement, based on a Red Cross report, that the gas was likely to have been halogenous derivatives - phosgene, mustard gas, lewisite, chloride or cyanogen bromide.

    The gas attacks stopped for three weeks after the Six-Day War of June, but resumed on July, against all parts of royalist Yemen. Casualty estimates vary, and an assumption, considered conservative, is that the mustard and phosgene-filled aerial bombs caused approximately 1,500 fatalities and 1,500 injuries.

    Cold War

    After World War II, the Allies
    Allies
    In everyday English usage, allies are people, groups, or nations that have joined together in an association for mutual benefit or to achieve some common purpose, whether or not explicit agreement has been worked out between them...

     recovered German artillery shells containing the three German nerve agents of the day (tabun, sarin
    Sarin
    Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...

    , and soman
    Soman
    Soman, or GD , is an extremely toxic chemical substance. It is a nerve agent, interfering with normal functioning of the mammalian nervous system by inhibiting the cholinesterase enzyme. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations according to UN...

    ), prompting further research into nerve agent
    Nerve agent
    Nerve agents are a class of phosphorus-containing organic chemicals that disrupt the mechanism by which nerves transfer messages to organs...

    s by all of the former Allies. Although the threat of global thermonuclear war was foremost in the minds of most during the Cold War
    Cold War
    The Cold War was the continuing state from roughly 1946 to 1991 of political conflict, military tension, proxy wars, and economic competition between the Communist World—primarily the Soviet Union and its satellite states and allies—and the powers of the Western world, primarily the United States...

    , both the Soviet
    Soviet Union
    The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

     and Western governments put enormous resources into developing chemical and biological weapons.

    There is some evidence suggesting that Vietnam
    Vietnam
    Vietnam – sometimes spelled Viet Nam , officially the Socialist Republic of Vietnam – is the easternmost country on the Indochina Peninsula in Southeast Asia. It is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, and the South China Sea –...

    ese troops used phosgene
    Phosgene
    Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...

     gas against Cambodia
    Cambodia
    Cambodia , officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia...

    n resistance forces in Thailand
    Thailand
    Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

     during the 1984-1985 dry-season offensive on the Thai-Cambodian border.

    Developments by the Western governments

    In 1952, researchers in Porton Down
    Porton Down
    Porton Down is a United Kingdom government and military science park. It is situated slightly northeast of Porton near Salisbury in Wiltshire, England. To the northwest lies the MoD Boscombe Down test range facility which is operated by QinetiQ...

    , England
    England
    England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

    , invented the VX
    VX (nerve agent)
    VX, IUPAC name O-ethyl S-[2-ethyl] methylphosphonothioate, is an extremely toxic substance whose only application is in chemical warfare as a nerve agent. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations in UN Resolution 687...

     nerve agent but soon abandoned the project. In 1958 the British government traded their VX technology with the United States
    United States
    The United States of America is a federal constitutional republic comprising fifty states and a federal district...

     in exchange for information on thermonuclear weapons; by 1961 the U.S. was producing large amounts of VX and performing its own nerve agent research. This research produced at least three more agents; the four agents (VE
    VE (nerve agent)
    VE is a "V-series" nerve agent closely related to the better-known VX nerve agent.Like most of the agents in the V-series , VE has not been extensively studied outside of military science...

    , VG
    VG (nerve agent)
    VG is a "V-series" nerve agent chemically similar to the better-known VX nerve agent. Tetram is the common Russian name for the substance...

    , VM
    VM (nerve agent)
    VM is a "V-series" nerve agent closely related to the better-known VX nerve agent.Like most of the agents in the V-series , VM has not been extensively studied outside of military science...

    , VX) are collectively known as the "V-Series" class of nerve agents.

    Also in 1952 the U.S. Army patented a process for the "Preparation of Toxic Ricin
    Ricin
    Ricin , from the castor oil plant Ricinus communis, is a highly toxic, naturally occurring protein. A dose as small as a few grains of salt can kill an adult. The LD50 of ricin is around 22 micrograms per kilogram Ricin , from the castor oil plant Ricinus communis, is a highly toxic, naturally...

    ", publishing a method of producing this powerful toxin
    Toxin
    A toxin is a poisonous substance produced within living cells or organisms; man-made substances created by artificial processes are thus excluded...

    .

    During the 1960s, the U.S. explored the use of anticholinergic deliriant incapacitating agent
    Incapacitating agent
    The term incapacitating agent is defined by the U.S. Department of Defense asLethal agents are primarily intended to kill, but incapacitating agents can also kill if administered in a potent enough dose, or in certain scenarios....

    s. One of these agents, assigned the weapon designation BZ
    3-Quinuclidinyl benzilate
    3-quinuclidinyl benzilate , IUPAC name 1-azabicyclo[2.2.2]Oct-3-yl α-hydroxy-α-phenylbenzeneacetate, is an odorless military incapacitating agent. Its NATO code is BZ...

    , was allegedly used experimentally in the Vietnam War
    Vietnam War
    The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

    . These allegations inspired the 1990 fictional film Jacob's Ladder.

    Herbicidal warfare

    In 1961 and 62 the Kennedy administration authorized the use of chemicals to destroy vegetation and food crops in South Vietnam
    South Vietnam
    South Vietnam was a state which governed southern Vietnam until 1975. It received international recognition in 1950 as the "State of Vietnam" and later as the "Republic of Vietnam" . Its capital was Saigon...

    . Between 1961 and 1967 the US Air Force sprayed 12 million US gallons of concentrated herbicides, mainly Agent Orange
    Agent Orange
    Agent Orange is the code name for one of the herbicides and defoliants used by the U.S. military as part of its herbicidal warfare program, Operation Ranch Hand, during the Vietnam War from 1961 to 1971. Vietnam estimates 400,000 people were killed or maimed, and 500,000 children born with birth...

     (containing dioxin as an impurity in the manufacturing process) over 6 million acres (24,000 km²) of foliage and trees, affecting an estimated 13% of South Vietnam's land. In 1965, 42% of all herbicides were sprayed over food crops. Besides destroying vegetation used as cover by the NLF and destroying food crops the herbicide was used to drive civilians into RVN
    South Vietnam
    South Vietnam was a state which governed southern Vietnam until 1975. It received international recognition in 1950 as the "State of Vietnam" and later as the "Republic of Vietnam" . Its capital was Saigon...

    -controlled areas.

    In 1997, an article published by the Wall Street Journal reported that up to half a million children were born with dioxin related deformities, and that the birth defects in North Vietnam were fourfold those in the South. The use of Agent Orange may have been contrary to international rules of war at the time. It is also of note that the most likely victims of such an assault would be small children. A 1967 study by the Agronomy Section of the Japanese Science Council concluded that 3.8 million acres (15,000 km²) of land had been destroyed, killing 1000 peasants and 13,000 livestock.

    Exposure and chemical disarmament

    Between 1967 and 1968, the U.S. decided to dispose of obsolete chemical weapons in an operation called Operation CHASE
    Operation CHASE
    Operation CHASE was a United States Department of Defense program that involved the disposal of unwanted munitions at sea from May 1964 into the early 1970s....

    , which stood for "cut holes and sink 'em." Several shiploads of chemical and conventional weapons were put aboard old Liberty ship
    Liberty ship
    Liberty ships were cargo ships built in the United States during World War II. Though British in conception, they were adapted by the U.S. as they were cheap and quick to build, and came to symbolize U.S. wartime industrial output. Based on vessels ordered by Britain to replace ships torpedoed by...

    s and sunk at sea.

    In 1969, 23 U.S. servicemen and one U.S. civilian stationed in Okinawa
    Okinawa Prefecture
    is one of Japan's southern prefectures. It consists of hundreds of the Ryukyu Islands in a chain over long, which extends southwest from Kyūshū to Taiwan. Okinawa's capital, Naha, is located in the southern part of Okinawa Island...

    , Japan
    Japan
    Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

    , were exposed to low levels of the nerve agent sarin while repainting the depots' buildings. The weapons had been kept secret from Japan
    Japan
    Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

    , sparking a furor in that country and an international incident. These munitions were moved in 1971 to Johnston Atoll
    Johnston Atoll
    Johnston Atoll is a atoll in the North Pacific Ocean about west of Hawaii. There are four islands located on the coral reef platform, two natural islands, Johnston Island and Sand Island, which have been expanded by coral dredging, as well as North Island and East Island , an additional two...

     under Operation Red Hat
    Operation Red Hat
    Operation Red Hat was a U.S. military action taking place in 1971, which involved the movement of chemical warfare munitions from Okinawa, Japan to Johnston Atoll in the North Pacific Ocean.-Operation:...

    .
    A UN
    United Nations
    The United Nations is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace...

     working group
    Working group
    A working group is an interdisciplinary collaboration of researchers working on new research activities that would be difficult to develop under traditional funding mechanisms . The lifespan of the WG can last anywhere between a few months and several years...

     began work on chemical disarmament in 1980. On April 4, 1984, U.S. President
    President of the United States
    The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....

     Ronald Reagan
    Ronald Reagan
    Ronald Wilson Reagan was the 40th President of the United States , the 33rd Governor of California and, prior to that, a radio, film and television actor....

     called for an international ban on chemical weapons. U.S. President George H.W. Bush and Soviet Union
    Soviet Union
    The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

     leader Mikhail Gorbachev
    Mikhail Gorbachev
    Mikhail Sergeyevich Gorbachev is a former Soviet statesman, having served as General Secretary of the Communist Party of the Soviet Union from 1985 until 1991, and as the last head of state of the USSR, having served from 1988 until its dissolution in 1991...

     signed a bilateral treaty
    Treaty
    A treaty is an express agreement under international law entered into by actors in international law, namely sovereign states and international organizations. A treaty may also be known as an agreement, protocol, covenant, convention or exchange of letters, among other terms...

     on June 1, 1990, to end chemical weapon production and start destroying each of their nation's stockpiles. The multilateral Chemical Weapons Convention
    Chemical Weapons Convention
    The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

     (CWC) was signed in 1993 and entered into force (EIF) in 1997.

    In December, 2001, the United States Department of Health and Human Services, CDC, NIOSH
    National Institute for Occupational Safety and Health
    The National Institute for Occupational Safety and Health is the United States’ federal agency responsible for conducting research and making recommendations for the prevention of work-related injury and illness. NIOSH is part of the Centers for Disease Control and Prevention within the U.S...

    , National Personal Protective Technology Laboratory (NPPTL), along with the U.S. Army Research, Development Engineering Command Edgewood Chemical/Biological Center (ECBC), and the U.S. Department of Commerce
    United States Department of Commerce
    The United States Department of Commerce is the Cabinet department of the United States government concerned with promoting economic growth. It was originally created as the United States Department of Commerce and Labor on February 14, 1903...

     National Institute for Standards and Technology
    National Institute of Standards and Technology
    The National Institute of Standards and Technology , known between 1901 and 1988 as the National Bureau of Standards , is a measurement standards laboratory, otherwise known as a National Metrological Institute , which is a non-regulatory agency of the United States Department of Commerce...

     (NIST) published the first of six technical performance standards and test procedures designed to evaluate and certify respirators intended for use by civilian emergency responders to a chemical, biological, radiological, or nuclear weapon release, detonation, or terrorism incident. To date NIOSH/NPPTL has published six new respirator performance standards based on a tiered approach that relies on traditional industrial respirator certification policy, next generation emergency response respirator performance requirements, and special live chemical warfare agent testing requirements of the classes of respirators identified to offer respiratory protection against chemical, biological, radiological, and nuclear (CBRN) agent inhalation hazards. These CBRN respirators are commonly known as open-circuit self-contained breathing apparatus (CBRN SCBA), air-purifying respirator (CBRN APR), air-purifying escape respirator (CBRN APER), self-contained escape respirator (CBRN SCER) and loose or tight fitting powered air-purifying respirators (CBRN PAPR). Current NIOSH-approved/certified CBRN respirator concept standards and test procedures can be found at the webpage.

    United States Senate Report

    A 1994 United States Senate Report, entitled "Is military research hazardous to veterans health?
    Lessons spanning a half century," detailed the United States Department of Defense
    United States Department of Defense
    The United States Department of Defense is the U.S...

    's practice of experimenting on animal and human subjects, often without their knowledge or consent. This included:
    • Approximately 60,000 [US] military personnel were used as human subjects in the 1940s to test the chemical agents mustard gas and lewisite
      Lewisite
      Lewisite is an organoarsenic compound, specifically an arsine. It was once manufactured in the U.S. and Japan as a chemical weapon, acting as a vesicant and lung irritant...

      . "Mustard" section,
    • Between the 1950s through the 1970s, at least 2,200 military personnel were subjected to various biological agent
      Biological agent
      A biological agent — also called bio-agent or biological threat agent — is a bacterium, virus, prion, or fungus which may cause infection, allergy, toxicity or otherwise create a hazard to human health. They can be used as a biological weapon in bioterrorism or biological warfare...

      s, referred to as Operation Whitecoat
      Operation Whitecoat
      Operation Whitecoat was the name given to a medical research program carried out by the US Army at Fort Detrick, Maryland during the period 1954–1973. The program involved conducting medical research using volunteer enlisted personnel who eventually became nicknamed "White Coats"...

      . Unlike most of the studies discussed in this report, Operation Whitecoat was truly voluntary. "Seventh" section,
    • Between 1951 and 1969, Dugway Proving Ground
      Dugway Proving Ground
      Dugway Proving Ground is a US Army facility located approximately 85 miles southwest of Salt Lake City, Utah in southern Tooele County and just north of Juab County...

       was the site of testing for various chemical and biological agents, including an open air aerodynamic dissemination test in 1968 that accidentally killed, on neighboring farms, approximately 6,400 sheep
      Dugway sheep incident
      The Dugway sheep incident, also known as the Skull Valley sheep kill, was a 1968 sheep kill that has been connected to United States Army chemical and biological warfare programs at Dugway Proving Ground in Utah...

       by an unspecified nerve agent
      Nerve agent
      Nerve agents are a class of phosphorus-containing organic chemicals that disrupt the mechanism by which nerves transfer messages to organs...

      ."Dugway" section,

    Project SHAD

    From 1962 to 1973, the Department of Defense
    United States Department of Defense
    The United States Department of Defense is the U.S...

     planned 134 tests under Project 112
    Project 112
    Project 112 was a biological and chemical weapons experimentation project conducted by the US Army from 1962 to 1973. The project started under John F. Kennedy's administration, and was authorized by his Secretary of Defense Robert McNamara, as part of a total review of the US military. The name...

    , a chemical and biological weapons "vulnerability-testing program." In 2002, the Pentagon admitted for the first time that some of tests used real chemical and biological weapons, not just harmless stimulants.

    Specifically under Project SHAD
    Project SHAD
    Project SHAD stands for Project Shipboard Hazard and Defense, a series of Cold War-era tests by the United States Department of Defense of biological weapons and chemical weapons...

    , 37 secret tests were conducted in California, Alaska, Florida, Hawaii, Maryland and Utah. Land tests in Alaska and Hawaii used artillery shells filled with sarin
    Sarin
    Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...

     and VX
    VX
    VX may refer to:* VX , a neurotoxic chemical warfare agent* ACES Colombia, a now-defunct airline, IATA code* vx, an airplane's best angle of climb airspeed; see V speeds...

    , while Navy trials off the coasts of Florida, California and Hawaii tested the ability of ships and crew to perform under biological and chemical warfare, without the crew's knowledge. The code name for the sea tests was Project Shipboard Hazard and Defense -- "SHAD" for short.

    In October 2002, the Senate Armed Forces Subcommittee on Personnel held hearings, as the controversial news broke that chemical agents had been tested on thousands of American military personnel. The hearings were chaired by Senator Max Cleland
    Max Cleland
    Joseph Maxwell Cleland is an American politician from Georgia. Cleland, a Democrat, is a disabled US Army veteran of the Vietnam War, a recipient of the Silver Star and the Bronze Star for valorous action in combat, and a former U.S. Senator...

    , former VA administrator and Vietnam War veteran.

    Developments by the Soviet government

    Due to the secrecy of the Soviet Union's government, very little information was available about the direction and progress of the Soviet chemical weapons until relatively recently. After the fall of the Soviet Union, Russia
    Russia
    Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

    n chemist Vil Mirzayanov published articles revealing illegal chemical weapons experimentation in Russia.

    In 1993, Mirzayanov was imprisoned and fired from his job at the State Research Institute of Organic Chemistry and Technology, where he had worked for 26 years. In March 1994, after a major campaign by U.S. scientists on his behalf, Mirzayanov was released.

    Among the information related by Vil Mirzayanov was the direction of Soviet research into the development of even more toxic nerve agents, which saw most of its success during the mid-1980s. Several highly toxic agents were developed during this period; the only unclassified information regarding these agents is that they are known in the open literature only as "Foliant" agents (named after the program under which they were developed) and by various code designations, such as A-230 and A-232.

    According to Mirzayanov, the Soviets also developed weapons that were safer to handle, leading to the development of the binary weapons, in which precursors for the nerve agents are mixed in a munition to produce the agent just prior to its use. Because the precursors are generally significantly less hazardous than the agents themselves, this technique makes handling and transporting the munitions a great deal simpler.

    Additionally, precursors to the agents are usually much easier to stabilize than the agents themselves, so this technique also made it possible to increase the shelf life
    Shelf life
    Shelf life is the length of time that food, drink, medicine, chemicals, and many other perishable items are given before they are considered unsuitable for sale, use, or consumption...

     of the agents a great deal. During the 1980s and 1990s, binary versions of several Soviet agents were developed and are designated as "Novichok" agents (after the Russian word for "newcomer"). Together with Lev Fedorov, he told the secret Novichok story exposed in the newspaper Moscow News
    Moscow News
    The Moscow News, which began publication in 1930, is Russia’s oldest English-language publication newspaper. Many of its feature articles used to be translated from the now defunct Russian Moskovskiye Novosti.-History:...

    .

    Iran–Iraq War

    The Iran–Iraq War began in 1980 when Iraq attacked Iran. Early in the conflict, Iraq began to employ mustard gas and tabun delivered by bombs dropped from airplanes; approximately 5% of all Iranian casualties are directly attributable to the use of these agents.

    Chemical weapons employed by Saddam Hussein
    Saddam Hussein
    Saddam Hussein Abd al-Majid al-Tikriti was the fifth President of Iraq, serving in this capacity from 16 July 1979 until 9 April 2003...

     killed and injured numerous Iranians
    Iranian peoples
    The Iranian peoples are an Indo-European ethnic-linguistic group, consisting of the speakers of Iranian languages, a major branch of the Indo-European language family, as such forming a branch of Indo-European-speaking peoples...

    , and possibly Iraqis. According to Iraqi documents, assistance in developing chemical weapons was obtained from firms in many countries, including the United States
    United States
    The United States of America is a federal constitutional republic comprising fifty states and a federal district...

    , West Germany
    West Germany
    West Germany is the common English, but not official, name for the Federal Republic of Germany or FRG in the period between its creation in May 1949 to German reunification on 3 October 1990....

    , the Netherlands
    Netherlands
    The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

    , the United Kingdom
    United Kingdom
    The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

    , and France
    France
    The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

    .

    About 100,000 Iranian soldiers were victims of Iraq's chemical attacks. Many were hit by mustard gas. The official estimate does not include the civilian population contaminated in bordering towns or the children and relatives of veterans, many of whom have developed blood, lung and skin complications, according to the Organization for Veterans. Nerve gas agents killed about 20,000 Iranian soldiers immediately, according to official reports. Of the 80,000 survivors, some 5,000 seek medical treatment regularly and about 1,000 are still hospitalized with severe, chronic conditions.
    Shortly before war ended in 1988, the Iraqi Kurd
    Kürd
    Kürd or Kyurd or Kyurt may refer to:*Kürd Eldarbəyli, Azerbaijan*Kürd Mahrızlı, Azerbaijan*Kürd, Goychay, Azerbaijan*Kürd, Jalilabad, Azerbaijan*Kürd, Qabala, Azerbaijan*Qurdbayram, Azerbaijan...

    ish village of Halabja
    Halabja
    Halabja , is a Kurdish town in Northern Iraq, located about north-east of Baghdad and 8–10 miles from the Iranian border....

     was exposed to multiple chemical agents, killing about 5,000 of the town's 50,000 residents.

    During the Gulf War
    Gulf War
    The Persian Gulf War , commonly referred to as simply the Gulf War, was a war waged by a U.N.-authorized coalition force from 34 nations led by the United States, against Iraq in response to Iraq's invasion and annexation of Kuwait.The war is also known under other names, such as the First Gulf...

     in 1991, Coalition forces began a ground war in Iraq. Despite the fact that they did possess chemical weapons, Iraq did not use any chemical agents against coalition forces. The commander of the Allied Forces, Gen. H. Norman Schwarzkopf
    Norman Schwarzkopf, Jr.
    General Herbert Norman Schwarzkopf KCB , also known as "Stormin' Norman" and "The Bear", is a retired United States Army General who, while he served as Commander of U.S. Central Command, was commander of the Coalition Forces in the Gulf War of 1991.-Early life:Schwarzkopf was born in Trenton, New...

    , suggested this may have been due to Iraqi fear of retaliation with nuclear weapon
    Nuclear weapon
    A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion. Both reactions release vast quantities of energy from relatively small amounts of matter. The first fission bomb test released the same amount...

    s.

    Falklands War

    Technically, the reported employment of tear gas by Argentine
    Argentina
    Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

     forces during the 1982 invasion of the Falkland Islands
    1982 invasion of the Falkland Islands
    On 2 April 1982, Argentine forces mounted amphibious landings of the Falkland Islands . The invasion involved an initial defence force organised by the Falkland Islands' Governor Sir Rex Hunt giving command to Major Mike Norman of the Royal Marines, the landing of Lieutenant-Commander Guillermo...

     constitutes chemical warfare. However, the tear gas grenades were employed as nonlethal weapons to avoid British casualties. The barrack buildings the weapons were used on proved to be deserted in any case. The British claim that more lethal, but legally-justifiable as they are not considered chemical weapons under the Chemical Weapons Convention
    Chemical Weapons Convention
    The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

    , white phosphorus grenades were used.

    Sri Lanka

    There have been reports of the Sri Lankan military's usage of deadly chemical weapons (in 2008 - 2009) on civilians in its fight against the Liberation Tigers of Tamil Eelam (LTTE
    Liberation Tigers of Tamil Eelam
    The Liberation Tigers of Tamil Eelam was a separatist militant organization formerly based in northern Sri Lanka. Founded in May 1976 by Vellupillai Prabhakaran, it waged a violent secessionist and nationalist campaign to create an independent state in the north and east of Sri Lanka for Tamil...

    ).

    Terrorism

    For many terrorist
    Terrorism
    Terrorism is the systematic use of terror, especially as a means of coercion. In the international community, however, terrorism has no universally agreed, legally binding, criminal law definition...

     organizations, chemical weapons might be considered an ideal choice for a mode of attack, if they are available: they are cheap, relatively accessible, and easy to transport. A skilled chemist can readily synthesize most chemical agents if the precursors are available.
    The earliest successful use of chemical agents in a non-combat setting was in 1946, motivated by a desire to obtain revenge on Germans
    Germany
    Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

     for the Holocaust
    The Holocaust
    The Holocaust , also known as the Shoah , was the genocide of approximately six million European Jews and millions of others during World War II, a programme of systematic state-sponsored murder by Nazi...

    . Three members of a Jewish group calling themselves Dahm Y'Israel Nokeam
    Nakam
    The Nokmim, also referred to as The Avengers or the Jewish Avengers, were alleged groups of Jewish assassins that targeted Nazi war criminals with the aim of avenging the Holocaust....

     ("Avenging Israel's Blood") hid in a bakery in the Stalag 13 prison camp near Nuremberg, Germany, where several thousand SS troops were being detained. The three applied an arsenic-containing mixture to loaves of bread, sickening more than 2,000 prisoners, of whom more than 200 required hospitalization.

    In July 1974, a group calling themselves the Aliens of America successfully firebombed the houses of a judge, two police commissioners, and one of the commissioner’s cars, burned down two apartment buildings, and bombed the Pan Am
    Pan American World Airways
    Pan American World Airways, commonly known as Pan Am, was the principal and largest international air carrier in the United States from 1927 until its collapse on December 4, 1991...

     Terminal at Los Angeles International Airport
    Los Angeles International Airport
    Los Angeles International Airport is the primary airport serving the Greater Los Angeles Area, the second-most populated metropolitan area in the United States. It is most often referred to by its IATA airport code LAX, with the letters pronounced individually...

    , killing three people and injuring eight. The organization, which turned out to be a single resident alien named Muharem Kurbegovic, claimed to have developed and possessed a supply of sarin, as well as 4 unique nerve agents named AA1, AA2, AA3, and AA4S. Although no agents were found at the time he was arrested in August 1974, he had reportedly acquired "all but one" of the ingredients required to produce a nerve agent. A search of his apartment turned up a variety of materials, including precursors for phosgene
    Phosgene
    Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...

     and a drum containing 25 pounds of sodium cyanide
    Sodium cyanide
    Sodium cyanide is an inorganic compound with the formula NaCN. This highly toxic colorless salt is used mainly in gold mining but has other niche applications...

    .

    The first successful use of chemical agents by terrorists against a general civilian population was on June 27, 1994, when Aum Shinrikyo
    Aum Shinrikyo
    Aum Shinrikyo was a Japanese new religious movement. The group was founded by Shoko Asahara in 1984. The group gained international notoriety in 1995, when it carried out the Sarin gas attack on the Tokyo subway....

    , an apocalyptic group based in Japan
    Japan
    Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

     that believed it necessary to destroy the planet, released sarin gas in Matsumoto, Japan
    Matsumoto, Nagano
    is a city located in Nagano Prefecture, Japan. Matsumoto is designated as a Special City.-Outline:The new city of Matsumoto is the city comprising the mergers of the old city of Matsumoto and four villages. Matsumoto officially absorbed those villages without creating a new municipal...

    , killing eight and harming 200. The following year, Aum Shinrikyo released sarin into the Tokyo subway system
    Sarin gas attack on the Tokyo subway
    The Sarin attack on the Tokyo subway, usually referred to in the Japanese media as the , was an act of domestic terrorism perpetrated by members of Aum Shinrikyo on March 20, 1995....

     killing 12 and injuring over 5,000.

    On 29 December 1999, four days after Russian forces began assault of Grozny, Chechen terrorists exploded two chlorine tanks in the town. Because of the wind conditions, no Russian soldiers were injured.

    In 2001, after carrying out the attacks
    September 11, 2001 attacks
    The September 11 attacks The September 11 attacks The September 11 attacks (also referred to as September 11, September 11th or 9/119/11 is pronounced "nine eleven". The slash is not part of the pronunciation...

     in New York City
    New York City
    New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

     on September 11, the organization Al Qaeda announced that they were attempting to acquire radiological, biological and chemical weapons. This threat was lent a great deal of credibility when a large archive of videotapes was obtained by the cable television
    Cable television
    Cable television is a system of providing television programs to consumers via radio frequency signals transmitted to televisions through coaxial cables or digital light pulses through fixed optical fibers located on the subscriber's property, much like the over-the-air method used in traditional...

     network CNN
    CNN
    Cable News Network is a U.S. cable news channel founded in 1980 by Ted Turner. Upon its launch, CNN was the first channel to provide 24-hour television news coverage, and the first all-news television channel in the United States...

     in August 2002 showing, among other things, the killing of three dogs by an apparent nerve agent.

    On October 26, 2002, Russian special forces used a chemical agent (presumably KOLOKOL-1
    Kolokol-1
    Kolokol-1 is a synthetic opioid, developed for use as an aerosolizable incapacitating agent. Although the exact chemical structure has not yet been revealed, it is thought to be a derivative of the potent opioid fentanyl, most probably 3-methylfentanyl dissolved in halothane as an organic...

    , an aerosol
    Aerosol
    Technically, an aerosol is a suspension of fine solid particles or liquid droplets in a gas. Examples are clouds, and air pollution such as smog and smoke. In general conversation, aerosol usually refers to an aerosol spray can or the output of such a can...

    ized fentanyl derivative), as a precursor to an assault on Chechen
    Chechnya
    The Chechen Republic , commonly referred to as Chechnya , also spelled Chechnia or Chechenia, sometimes referred to as Ichkeria , is a federal subject of Russia . It is located in the southeastern part of Europe in the Northern Caucasus mountains. The capital of the republic is the city of Grozny...

     terrorists, ending the Moscow theater hostage crisis
    Moscow theater hostage crisis
    The Moscow theater hostage crisis, also known as the 2002 Nord-Ost siege, was the seizure of the crowded Dubrovka Theater on 23 October 2002 by some 40 to 50 armed Chechens who claimed allegiance to the Islamist militant separatist movement in Chechnya. They took 850 hostages and demanded the...

    . All 42 of the terrorists and 120 of the hostages were killed during the raid; all but one hostage, who was killed, died from the effects of the agent.

    In early 2007 multiple terrorist bombings have been reported in Iraq
    Iraq
    Iraq ; officially the Republic of Iraq is a country in Western Asia spanning most of the northwestern end of the Zagros mountain range, the eastern part of the Syrian Desert and the northern part of the Arabian Desert....

     using chlorine gas. These attacks have wounded or sickened more than 350 people. Reportedly the bombers are affiliated with Al-Qaeda
    Al-Qaeda
    Al-Qaeda is a global broad-based militant Islamist terrorist organization founded by Osama bin Laden sometime between August 1988 and late 1989. It operates as a network comprising both a multinational, stateless army and a radical Sunni Muslim movement calling for global Jihad...

     in Iraq and have used bombs of various sizes up to chlorine tanker trucks. United Nations Secretary-General
    United Nations Secretary-General
    The Secretary-General of the United Nations is the head of the Secretariat of the United Nations, one of the principal organs of the United Nations. The Secretary-General also acts as the de facto spokesperson and leader of the United Nations....

     Ban Ki-moon
    Ban Ki-moon
    Ban Ki-moon is the eighth and current Secretary-General of the United Nations, after succeeding Kofi Annan in 2007. Before going on to be Secretary-General, Ban was a career diplomat in South Korea's Ministry of Foreign Affairs and in the United Nations. He entered diplomatic service the year he...

     condemned the attacks as, "clearly intended to cause panic and instability in the country."

    Demilitarisation of Chemical Weapon stocks

    The Protocol for the Prohibition of the Use in War of Asphyxiating, Poisonous or other Gases, and the Bacteriological Methods of Warfare, or the Geneva Convention, is an International treaty which prohibits the use of chemical and biological weapons in warfare. Signed into International Law
    International law
    Public international law concerns the structure and conduct of sovereign states; analogous entities, such as the Holy See; and intergovernmental organizations. To a lesser degree, international law also may affect multinational corporations and individuals, an impact increasingly evolving beyond...

     at Geneva
    Geneva
    Geneva In the national languages of Switzerland the city is known as Genf , Ginevra and Genevra is the second-most-populous city in Switzerland and is the most populous city of Romandie, the French-speaking part of Switzerland...

     on June 17, 1925 and entered into force on February 8, 1928, this treaty states that chemical and biological weapons
    Biological warfare
    Biological warfare is the use of biological toxins or infectious agents such as bacteria, viruses, and fungi with intent to kill or incapacitate humans, animals or plants as an act of war...

     are "justly condemned by the general opinion of the civilised world."

    The most recent arms control agreement in International Law
    International law
    Public international law concerns the structure and conduct of sovereign states; analogous entities, such as the Holy See; and intergovernmental organizations. To a lesser degree, international law also may affect multinational corporations and individuals, an impact increasingly evolving beyond...

    , the Convention of the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction, or the Chemical Weapons Convention, outlaws the production, stockpiling, and use of chemical weapons. It is administered by the Organisation for the Prohibition of Chemical Weapons
    Organisation for the Prohibition of Chemical Weapons
    The Organisation for the Prohibition of Chemical Weapons is an intergovernmental organization, located in The Hague, Netherlands. The organization promotes and verifies the adherence to the Chemical Weapons Convention which prohibits of the use of chemical weapons and requires their destruction...

     (OPCW), an intergovernmental organisation based in The Hague
    The Hague
    The Hague is the capital city of the province of South Holland in the Netherlands. With a population of 500,000 inhabitants , it is the third largest city of the Netherlands, after Amsterdam and Rotterdam...

    .

    India

    In June 1997, India declared that it had a stockpile of 1044 tonnes of sulphar mustard in its possession. India's declaration of its stockpiled came after its entry into the Chemical Weapons Convention
    Chemical Weapons Convention
    The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

    , that created the Organisation for the Prohibition of Chemical Weapons
    Organisation for the Prohibition of Chemical Weapons
    The Organisation for the Prohibition of Chemical Weapons is an intergovernmental organization, located in The Hague, Netherlands. The organization promotes and verifies the adherence to the Chemical Weapons Convention which prohibits of the use of chemical weapons and requires their destruction...

    , and on January 14, 1993 India became one of the original signatories to the Chemical Weapons Convention
    Chemical Weapons Convention
    The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

    . By 2005, from among six nations that had declared their possession of chemical weapons, India was the only country to meet its deadline for chemical weapons destruction and for inspection of its facilities by the Organisation for the Prohibition of Chemical Weapons
    Organisation for the Prohibition of Chemical Weapons
    The Organisation for the Prohibition of Chemical Weapons is an intergovernmental organization, located in The Hague, Netherlands. The organization promotes and verifies the adherence to the Chemical Weapons Convention which prohibits of the use of chemical weapons and requires their destruction...

    . By 2006, India had destroyed more than 75 percent of its chemical weapons and material stockpile and was granted an extension to complete a 100 percent destruction of its stocks by April 2009. On May 14, 2009 India informed the United Nations
    United Nations
    The United Nations is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace...

     that it has completely destroyed its stockpile of chemical weapons.

    Iraq

    The Director-Generar of the Organisation for the Prohibition of Chemical Weapons
    Organisation for the Prohibition of Chemical Weapons
    The Organisation for the Prohibition of Chemical Weapons is an intergovernmental organization, located in The Hague, Netherlands. The organization promotes and verifies the adherence to the Chemical Weapons Convention which prohibits of the use of chemical weapons and requires their destruction...

    , Ambassador Rogelio Pfirter, welcomed Iraq's decision to join the OPCW as a significant step to strengthening global and regional efforts to prevent the spread and use of chemical weapons. The OPCW announced "The government of Iraq has deposited its instrument of accession to the Chemical Weapons Convention with the Secretary General of the United Nations and within 30 days, on 12 February 2009, will become the 186th State Party to the Convention". Iraq has also declared stockpiles of chemical weapons, and because of their recent accession is the only State Party exempted from the destruction time-line.

    Japan

    During the Second Sino-Japanese War
    Second Sino-Japanese War
    The Second Sino-Japanese War was a military conflict fought primarily between the Republic of China and the Empire of Japan. From 1937 to 1941, China fought Japan with some economic help from Germany , the Soviet Union and the United States...

     (1937–1945) Japan stored chemical weapons on the territory of mainland China
    Mainland China
    Mainland China, the Chinese mainland or simply the mainland, is a geopolitical term that refers to the area under the jurisdiction of the People's Republic of China . According to the Taipei-based Mainland Affairs Council, the term excludes the PRC Special Administrative Regions of Hong Kong and...

    . The weapon stock mostly containing mustard gas-lewisite mixture. They weapons are classified as abandoned chemical weapons under the Chemical Weapons Convention
    Chemical Weapons Convention
    The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

     and from September 2010 Japan has started their destruction in Nanjing using mobile destruction facilities in order to do so.

    Russia

    Russia signed into the Chemical Weapons Convention
    Chemical Weapons Convention
    The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

     on January 13, 1993 and ratified it on November 5, 1995. Declaring an arsenal of 39,967 tons of chemical weapons in 1997, by far the largest arsenal, consisting of blister agents: Lewisite
    Lewisite
    Lewisite is an organoarsenic compound, specifically an arsine. It was once manufactured in the U.S. and Japan as a chemical weapon, acting as a vesicant and lung irritant...

    , Sulfur mustard
    Sulfur mustard
    The sulfur mustards, or sulphur mustards, commonly known as mustard gas, are a class of related cytotoxic, vesicant chemical warfare agents with the ability to form large blisters on exposed skin. Pure sulfur mustards are colorless, viscous liquids at room temperature...

    , Lewisite-mustard mix, and nerve agents: Sarin
    Sarin
    Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...

    , Soman
    Soman
    Soman, or GD , is an extremely toxic chemical substance. It is a nerve agent, interfering with normal functioning of the mammalian nervous system by inhibiting the cholinesterase enzyme. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations according to UN...

    , and VX
    VX
    VX may refer to:* VX , a neurotoxic chemical warfare agent* ACES Colombia, a now-defunct airline, IATA code* vx, an airplane's best angle of climb airspeed; see V speeds...

    . Russia met its treaty obligations by destroying 1 percent of its chemical agents by the 2002 deadline set out by the Chemical Weapons Convention, but requested an extension on the deadlines of 2004 and 2007 due to technical, financial, and environmental challenges of chemical disposal. Since, Russia has received help from other countries such as Canada which donated C$100,000, plus a further C$100,000 already donated, to the Russian Chemical Weapons Destruction Program. This money will be used to complete work at Shchuch'ye and support the construction of a chemical weapons destruction facility at Kizner (Russia), where the destruction of nearly 5,700 tonnes of nerve agent, stored in approximately 2 million artillery shells and munitions, will be undertaken. Canadian funds are also being used for the operation of a Green Cross Public Outreach Office, to keep the civilian population informed on the progress made in chemical weapons destruction activities.

    As of July 2012, Russia has destroyed 48 percent (18,241 tonnes) of its stockpile at destruction facilities located in Gorny (Saratov Oblast) and Kambarka (Udmurt Republic) - where operations have finished - and Schuch'ye (Kurgan Oblast), Maradykovsky (Kirov Oblast), Leonidovka (Penza Oblast) whilst installations are under construction in Pochep (Bryansk Oblast) and Kizner (Udmurt Republic).

    United States

    On November 25, 1969, President Richard Nixon
    Richard Nixon
    Richard Milhous Nixon was the 37th President of the United States, serving from 1969 to 1974. The only president to resign the office, Nixon had previously served as a US representative and senator from California and as the 36th Vice President of the United States from 1953 to 1961 under...

     unilaterally renounced the use of chemical weapons and renounced all methods of biological warfare. He issued a decree halting the production and transport of all chemical weapons which remains in effect. From May 1964 to the early 1970s the USA participated in Operation CHASE
    Operation CHASE
    Operation CHASE was a United States Department of Defense program that involved the disposal of unwanted munitions at sea from May 1964 into the early 1970s....

    , a United States Department of Defense
    United States Department of Defense
    The United States Department of Defense is the U.S...

     program that aimed to dispose of chemical weapons by sinking ships laden with the weapons in the deep Atlantic. After the Marine Protection, Research, and Sanctuaries Act
    Marine Protection, Research, and Sanctuaries Act
    Marine Protection, Research and Sanctuaries Act of 1972 or Ocean Dumping Act is one of several key environmental laws passed by the US Congress in 1972. The Act has two essential aims: to regulate intentional ocean disposal of materials, and to authorize any related research...

     of 1972, Operation Chase was scrapped and safer disposal methods for chemical weapons was researched, with the U.S. destroying several thousand tons of mustard gas by incineration at the Rocky Mountain Arsenal, and nearly 4,200 tons of nerve agent by chemical neutralisation at Tooele Army Depot.

    The U.S. ratified the Geneva Protocol which banned the use of chemical and biological weapons on January 22, 1975. In 1989 and 1990, the U.S. and the Soviet Union entered an agreement to both end their chemical weapons programs, including binary weapons. In April 1997, the United States ratified the Chemical Weapons Convention
    Chemical Weapons Convention
    The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

    , this banned the possession of most types of chemical weapons. It also banned the development of chemical weapons, and required the destruction of existing stockpiles, precursor chemicals, production facilities, and there weapon delivery systems.

    The U.S. began stockpile reductions in the 1980s with the removal of outdated munitions and destroying its entire stock of 3-Quinuclidinyl benzilate
    3-Quinuclidinyl benzilate
    3-quinuclidinyl benzilate , IUPAC name 1-azabicyclo[2.2.2]Oct-3-yl α-hydroxy-α-phenylbenzeneacetate, is an odorless military incapacitating agent. Its NATO code is BZ...

     (BZ or Agent 15) at the beginning of 1988. In June 1990 the Johnston Atoll Chemical Agent Disposal System
    Johnston Atoll Chemical Agent Disposal System
    Johnston Atoll Chemical Agent Disposal System was the U.S. Army's first chemical munitions disposal facility. It was located on Johnston Island, at Johnston Atoll and completed its mission and ceased operation in 2000.-Background:...

     began destruction of chemical agents stored on the Johnston Atoll
    Johnston Atoll
    Johnston Atoll is a atoll in the North Pacific Ocean about west of Hawaii. There are four islands located on the coral reef platform, two natural islands, Johnston Island and Sand Island, which have been expanded by coral dredging, as well as North Island and East Island , an additional two...

     in the Pacific, seven years before the Chemical Weapons Treaty came into effect. In 1986 President Ronald Reagan made an agreement with the Chancellor, Helmut Kohl to remove the U.S. stockpile of chemical weapons from Germany. In 1990, as part of Operation Steel Box
    Operation Steel Box
    Operation Steel Box, also known as Operation Golden Python, was a 1990 joint U.S.-West German operation which moved 100,000 U.S. chemical weapons from Germany to Johnston Atoll.-Background:...

    , two ships were loaded with over 100,000 shells containing Sarin
    Sarin
    Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...

     and VX
    VX (nerve agent)
    VX, IUPAC name O-ethyl S-[2-ethyl] methylphosphonothioate, is an extremely toxic substance whose only application is in chemical warfare as a nerve agent. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations in UN Resolution 687...

     where taken from the U.S. Army weapons storage depots such as Miesau and then-classified FSTS (Forward Storage / Transportation Sites) and transported from Bremerhaven Germany to Johnston Atoll in the pacific, a 46-day nonstop journey.

    In May of 1991, President George H.W. Bush committed the United States to destroying all of its chemical weapons and renounced the right to chemical weapon retaliation. In 1993, the United States signed the Chemical Weapons Treaty, which required the destruction of all chemical weapon agents, dispersal systems, and production facilities by April 2012. The U.S. prohibition on the transport of chemical weapons has meant that destruction facilities had to be constructed at each of the U.S.'s nine storage facilities. The U.S. met the first three of the four deadlines set out in the treaty, destroying 45% of its stockpile of chemical weapons by 2007. Due to the destruction of chemical weapons, under the United States policy of Proportional Response, an attack upon the United States or its Allies would trigger a force-equivalent counter-attack. Since the United States only maintains nuclear Weapons of Mass Destruction, it is the stated policy that the United States will regard all WMD attacks (Biological, chemical, or nuclear) as a nuclear attack and will respond to such an attack with a nuclear strike.

    As of 2011, stockpiles have been eliminated at 6 of the 9 chemical weapons depots and 89% of the 1997 stockpile has been destroyed. The U.S. anticipates closure of one more depot and a total of 90% stockpile reduction by the treaty deadline of April 2012. Destruction will not begin at the two remaining depots until after the treaty deadline and will use neutralization, instead of incineration.

    See also

    • Agreement on Destruction and Non-production of Chemical Weapons and on Measures to Facilitate the Multilateral Convention on Banning Chemical Weapons
    • Area denial weapons
      Area denial weapons
      An area denial weapon is a device used to prevent an adversary from occupying or traversing an area of land. The specific method used does not have to be totally effective in preventing passage as long as it is sufficient to severely restrict, slow down, or endanger the opponent...

    • Biological warfare
      Biological warfare
      Biological warfare is the use of biological toxins or infectious agents such as bacteria, viruses, and fungi with intent to kill or incapacitate humans, animals or plants as an act of war...

    • Chemical Ali
    • Chemical Weapons Convention
      Chemical Weapons Convention
      The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...

    • Churchill's advocacy of chemical strike against German cities
    • Exotic pollution
      Exotic pollution
      Exotic pollution is a general definition that includes attacks involving nuclear, chemical, or biological agents intended to cause harm or contaminate and make unfit for use....

    • Lethal Unitary Chemical Agents and Munitions
      Lethal Unitary Chemical Agents and Munitions
      A chemical weapon  is a device that uses chemicals formulated to inflict death or harm to human beings. They are classified as weapons of mass destruction, and have been "condemned by the civilised world". CW have been used in past conflicts—and preparedness doctrine anticipates the potential...

    • List of chemical warfare agents
    • List of highly toxic gases
    • Ronald Maddison
      Ronald Maddison
      Leading Aircraftman Ronald George Maddison was a twenty-year-old Royal Air Force engineer who died while acting as a volunteer human "guinea pig" while testing nerve agents at Porton Down, in Wiltshire, England...

    • Psychochemical weapon
    • Saint Julien Memorial
      Saint Julien Memorial
      The St. Julien Memorial is a Canadian war memorial and small commemorative park located in the village of Saint Julien , Belgium. The memorial commemorates the Canadian First Division's participation in the Second Battle of Ypres of World War I which included the defence against the first poison...

    • Sardasht
      Sardasht
      Sardasht is a city in and the capital of Sardasht County, West Azerbaijan Province, Iran. At the 2006 census, its population was 37,115, in 8,224 families....

       (A town attacked with chemical weapons during the Iran–Iraq War.)
    • Stink bomb
      Stink bomb
      A stink bomb or stinkbomb is a device designed to create an unpleasant smell. They range in effectiveness from simple pranks to military grade or riot control chemical agents.The Guinness Book of Records lists two smelliest substances...

    • USAMRICD
    • Weapons of mass destruction
      Weapons of mass destruction
      A weapon of mass destruction is a weapon that can kill and bring significant harm to a large number of humans and/or cause great damage to man-made structures , natural structures , or the biosphere in general...

    • Zyklon B
      Zyklon B
      Zyklon B was the trade name of a cyanide-based pesticide infamous for its use by Nazi Germany to kill human beings in gas chambers of extermination camps during the Holocaust. The "B" designation indicates one of two types of Zyklon...


    Further reading

    • Leo P. Brophy and George J. B. Fisher; The Chemical Warfare Service: Organizing for War Office of the Chief of Military History, 1959; L. P. Brophy, W. D. Miles and C. C. Cochrane, The Chemical Warfare Service: From Laboratory to Field (1959); and B. E. Kleber and D. Birdsell, The Chemical Warfare Service in Combat (1966). official US history;
    • Gordon M. Burck and Charles C. Flowerree; International Handbook on Chemical Weapons Proliferation 1991
    • L. F. Haber. The Poisonous Cloud: Chemical Warfare in the First World War Oxford University Press: 1986
    • James W. Hammond Jr; Poison Gas: The Myths Versus Reality Greenwood Press, 1999
    • Jiri Janata, Role of Analytical Chemistry in Defense Strategies Against Chemical and Biological Attack, Annual Review of Analytical Chemistry, 2009
    • Ishmael Jones, The Human Factor: Inside the CIA's Dysfunctional Intelligence Culture, Encounter Books, New York 2008, revised 2010, ISBN 978-1594033827. WMD espionage.
    • Benoit Morel and Kyle Olson; Shadows and Substance: The Chemical Weapons Convention Westview Press, 1993
    • Adrienne Mayor, "Greek Fire, Poison Arrows & Scorpion Bombs: Biological and Chemical Warfare in the Ancient World" Overlook-Duckworth, 2003, rev ed with new Introduction 2008
    • Geoff Plunkett, Chemical Warfare in Australia, Australian Military History Publications, 2007
    • Jonathan B. Tucker
      Jonathan B. Tucker
      Jonathan B. Tucker was a United States chemical and biological weapons expert. He died at the end of July 2011.-Education:Tucker earned a B.S. in biology from Yale University and a Ph.D...

      . Chemical Warfare from World War I to Al-Qaeda (2006)

    External links

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