Mongol invasion of Khwarezmia
Encyclopedia
The Mongol invasion of Khwarezmia from 1219 to 1221 marked the beginning of the Mongol conquest of the Islamic states, in the Mongol expansion would ultimately culminate in the conquest of virtually all of Eurasia, save for Western Europe
Western Europe
Western Europe is a loose term for the collection of countries in the western most region of the European continents, though this definition is context-dependent and carries cultural and political connotations. One definition describes Western Europe as a geographic entity—the region lying in the...

, Fennoscandia
Fennoscandia
Fennoscandia and Fenno-Scandinavia are geographic and geological terms used to describe the Scandinavian Peninsula, the Kola Peninsula, Karelia and Finland...

, the Byzantine Empire
Byzantine Empire
The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

, Arabia, Indian subcontinent
Indian subcontinent
The Indian subcontinent, also Indian Subcontinent, Indo-Pak Subcontinent or South Asian Subcontinent is a region of the Asian continent on the Indian tectonic plate from the Hindu Kush or Hindu Koh, Himalayas and including the Kuen Lun and Karakoram ranges, forming a land mass which extends...

, 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...

 and parts of 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...

.

Ironically, it was not originally the intention of the Mongol Empire
Mongol Empire
The Mongol Empire , initially named as Greater Mongol State was a great empire during the 13th and 14th centuries...

 to invade the Khwarezmid Empire. Genghis Khan had originally sent the ruler of the Khwarezmid Empire, Ala ad-Din Muhammad
Muhammad II of Khwarezm
Ala ad-Din Muhammad II was the ruler of the Khwarezmid Empire from 1200 to 1220. His ancestor was a Turkic slave who eventually became a viceroy of a small province named Khwarizm. After his father died, Muhammad inherited his father's lands, and it was from there he began expanding outwards...

, a message greeting him as his equal: "you rule the rising sun and I the setting sun". The Mongols' original unification of all "people in felt tents", unifying the nomad
Nomad
Nomadic people , commonly known as itinerants in modern-day contexts, are communities of people who move from one place to another, rather than settling permanently in one location. There are an estimated 30-40 million nomads in the world. Many cultures have traditionally been nomadic, but...

ic tribes in Mongolia and then the Turcomens and other nomadic peoples, had come with relatively little bloodshed, and almost no material loss. Even his invasions of China, to that point, had involved no more bloodshed than previous nomadic invasions had caused. The war started after the Mongol caravan and envoys were massacred in Khwarezmia.

It would be the invasion, absolute destruction and complete devastation of the Khwarezmid Empire which would earn the Mongols the name for bloodthirsty ferocity that would mark the remainder of their campaigns. In this brief war, lasting less than two years, not only was a huge empire destroyed utterly, but Genghis Khan introduced the world to cruel tactics - indirect attack, and complete and utter terror and slaughter of populations wholesale as weapons of war.

Origins of the conflict

After the defeat of the Kara-Khitans, Genghis Khan
Genghis Khan
Genghis Khan , born Temujin and occasionally known by his temple name Taizu , was the founder and Great Khan of the Mongol Empire, which became the largest contiguous empire in history after his death....

's Mongol Empire
Mongol Empire
The Mongol Empire , initially named as Greater Mongol State was a great empire during the 13th and 14th centuries...

 gained a border with the Khwarezmid Empire, governed by Shah
Shah
Shāh is the title of the ruler of certain Southwest Asian and Central Asian countries, especially Persia , and derives from the Persian word shah, meaning "king".-History:...

 Ala ad-Din Muhammad
Muhammad II of Khwarezm
Ala ad-Din Muhammad II was the ruler of the Khwarezmid Empire from 1200 to 1220. His ancestor was a Turkic slave who eventually became a viceroy of a small province named Khwarizm. After his father died, Muhammad inherited his father's lands, and it was from there he began expanding outwards...

. The shah had only recently taken some of the territory under his control, and he was also busy with a dispute with the caliph
Caliph
The Caliph is the head of state in a Caliphate, and the title for the ruler of the Islamic Ummah, an Islamic community ruled by the Shari'ah. It is a transcribed version of the Arabic word   which means "successor" or "representative"...

 in Baghdad
Baghdad
Baghdad is the capital of Iraq, as well as the coterminous Baghdad Governorate. The population of Baghdad in 2011 is approximately 7,216,040...

. The shah had refused to make the obligatory homage to the Caliph as titular leader of Islam, and demanded recognition as Sultan of his Empire, without any of the usual bribes or pretenses. This alone had created problems for him along his southern border. It was at this junction the rapidly expanding Mongol Empire made contact. Mongol historians are adamant that the Great Khan at that time had no intention of invading the Khwarezmid Empire, and was only interested in trade and even a potential alliance.

The shah was very suspicious of Genghis' desire for a trade agreement, and messages from the shah's ambassador at Zhongdu
Zhongdu
Zhongdu is the name that was used for the capital city of some of Chinese dynasties. This includes:* Zhongdu, the capital of the Jin Dynasty, now Beijing; see History of Beijing#Liao and Jin Dynasties...

 (Beijing
Beijing
Beijing , also known as Peking , is the capital of the People's Republic of China and one of the most populous cities in the world, with a population of 19,612,368 as of 2010. The city is the country's political, cultural, and educational center, and home to the headquarters for most of China's...

) in China described the exaggerated savagery of the Mongols when they assaulted the city during their war with the Jin Dynasty.
Of further interest is that the caliph of Baghdad, An-Nasir
An-Nasir
An-Nasir li-Din Allah was the 34th Abbasid Caliph in Baghdad from 1180 until his death. His laqab literally means The Victor for the Religion of God. He attempted to restore the Caliphate to its ancient dominant role and achieved a surprising amount of success, despite the fact that the...

, had attempted to instigate a war between the Mongols and the Shah some years before the Mongol invasion actually occurred. This attempt at an alliance with Genghis was done because of a dispute between Nasir and the Shah, but the Khan had no interest in alliance with any ruler who claimed ultimate authority, titular or not, and which marked the Caliphate for an extinction which would come from Genghis' grandson, Hulegu. At the time, this attempt by the Caliph involved the Shah's ongoing claim to be named sultan of Khwarezm, something that Nasir had no wish to grant, as the Shah refused to acknowledge his authority, however illusory such authority was. However, it is known that Genghis rejected the notion of war as he was engaged in war with the Jin Dynasty and was gaining much wealth from trading with the Khwarezmid Empire.

Genghis then sent a 500-man caravan
Camel train
A camel train is a series of camels carrying goods or passengers in a group as part of a regular or semi-regular service between two points. Although they rarely travelled faster than the walking speed of a man, camels' ability to handle harsh conditions made camel trains a vital part of...

 of Muslims to establish official trade ties with Khwarezmia. However Inalchuq, the governor of the Khwarezmian city of Otrar
Otrar
Otrar or Utrar is a Central Asian ghost town that was a city located along the Silk Road near the current town of Karatau in Kazakhstan. Otrar was an important town in the history of Central Asia, situated on the borders of settled and agricultural civilizations...

, had the members of the caravan that came from Mongolia arrested, claiming that the caravan was a conspiracy against Khwarezmia. It seems unlikely, however, that any members of the trade delegation were spies. Nor does it seem likely that Genghis was trying to provoke a conflict with the Khwarezmid Empire, considering he was still dealing with the Jin in northeastern China.

Genghis Khan then sent a second group of three ambassadors (one Muslim and two Mongols) to meet the shah himself and demand the caravan at Otrar be set free and the governor be handed over for punishment. The shah had both of the Mongols shaved and had the Muslim beheaded before sending them back to Genghis Khan. Muhammad also ordered the personnel of the caravan to be executed. This was seen as a grave affront to the Khan himself, who considered ambassadors "as sacred and inviolable." This led Genghis Khan to attack the Khwarezmian Dynasty. The Mongols
Mongols
Mongols ) are a Central-East Asian ethnic group that lives mainly in the countries of Mongolia, China, and Russia. In China, ethnic Mongols can be found mainly in the central north region of China such as Inner Mongolia...

 crossed the Tien Shan mountains
Tian Shan
The Tian Shan , also spelled Tien Shan, is a large mountain system located in Central Asia. The highest peak in the Tian Shan is Victory Peak , ....

, coming into the Shah's empire in 1219.

Initial invasion

After compiling information from many intelligence sources, primarily from spies along the Silk Road
Silk Road
The Silk Road or Silk Route refers to a historical network of interlinking trade routes across the Afro-Eurasian landmass that connected East, South, and Western Asia with the Mediterranean and European world, as well as parts of North and East Africa...

, Genghis Khan carefully prepared his army, which was organized differently from Genghis' earlier campaigns. The changes had come in adding supporting units to his dreaded cavalry, both heavy and light. While still relying on the traditional advantages of his mobile nomadic cavalry, Genghis incorporated many aspects of warfare from China, particularly in siege warfare. His baggage train included such siege equipment as battering rams, gunpowder
Gunpowder
Gunpowder, also known since in the late 19th century as black powder, was the first chemical explosive and the only one known until the mid 1800s. It is a mixture of sulfur, charcoal, and potassium nitrate - with the sulfur and charcoal acting as fuels, while the saltpeter works as an oxidizer...

, trebuchet
Trebuchet
A trebuchet is a siege engine that was employed in the Middle Ages. It is sometimes called a "counterweight trebuchet" or "counterpoise trebuchet" in order to distinguish it from an earlier weapon that has come to be called the "traction trebuchet", the original version with pulling men instead of...

s, and enormous siege bows
Ballista
The ballista , plural ballistae, was an ancient missile weapon which launched a large projectile at a distant target....

 capable of throwing 20-foot arrows into siege works. Also, the Mongol intelligence network was formidable. The Mongols never invaded an opponent whose military and economic will and ability to resist had not been thoroughly and completely scouted. For instance, Subutai and Batu Khan spent a year scouting central Europe, before destroying the armies of Hungary and Poland in two separate battles, two days apart.

The size of Genghis' army is often in dispute, ranging from a small army of 90,000 soldiers to a larger estimate of 250,000 soldiers, and Genghis brought along his most able generals to aide him. Genghis also brought a large body of foreigners with him, primarily of Chinese origin. These foreigners were siege experts, bridge-building experts, doctors and a variety of specialty soldiers.

During the invasion of Transoxania in 1219, along with the main Mongol force, Genghis Khan used a Chinese specialist catapult unit in battle, they were used again in 1220 in Transoxania. The Chinese may have used the catapults to hurl gunpowder bombs, since they already had them by this time While Genghis Khan was conquering Transoxania and Persia, several Chinese who were familiar gunpowder were serving with Genghis's army. Historians have suggested that the Mongol invasion had bourght Chinese gunpowder weapons to Central Asia. One of these was the huochong, a Chinese mortar.

In this invasion, the Khan first demonstrated the use of indirect attack that would become a hallmark of his later campaigns, and those of his sons and grandsons. The Khan divided his armies, and sent one force solely to find and execute the Shah
Shah
Shāh is the title of the ruler of certain Southwest Asian and Central Asian countries, especially Persia , and derives from the Persian word shah, meaning "king".-History:...

 - so that a ruler of an Empire as large as that of the Khan's, with a larger army, was forced to run for his life in his own country. The divided Mongol forces destroyed the Shah's forces piecemeal, and began the utter devastation of the country which would mark many of their later conquests.

The Shah's army, numbering roughly 400,000, was split among the various major cities. The Shah was fearful that his army, if placed in one large unit under a single command structure, might possibly be turned against him. Further, the Shah's reports from China indicated that the Mongols were not experts in siege warfare, and experienced problems when attempting to take fortified positions. The Shah's decisions on troop deployment would prove disastrous as the campaign unfolded.

Though tired from their journey, the Mongols still won their first victories against the Khwarezmian army. A Mongol army, under Jochi
Jochi
Jochi was the eldest of the Mongol chieftain Genghis Khan's four sons by his principal wife Börte. An accomplished military leader, he participated in his father's conquest of Central Asia, along with his brothers and uncles.-Early life:...

, with 25,000 to 30,000 men, attacked the Shah's army in southern Khwarezmia and prevented the much larger forces of the Shah from forcing them into the mountains.
The primary Mongol army, headed personally by Genghis Khan, reached the city of Otrar
Otrar
Otrar or Utrar is a Central Asian ghost town that was a city located along the Silk Road near the current town of Karatau in Kazakhstan. Otrar was an important town in the history of Central Asia, situated on the borders of settled and agricultural civilizations...

 in the fall of 1219. After besieging Otrar for five months, the Khan's forces managed to storm the main part of the city by entering a sally port gate that was not secured.
A further month went by before the citadel at Otrar was taken. Inalchuq held out until the end, even climbing to the top of the citadel in the last moments of the siege to throw down tiles at the oncoming Mongols. Genghis killed many of the inhabitants, enslaved the rest, and executed Inalchuq, possibly by pouring molten gold or silver down his throat as retribution for the capture of the Mongol caravan.

Sieges of Bukhara, Samarkand, and Urgench

Genghis placed his general Jebe
Jebe
Chepe Noyan was one of the prominent Noyans of Genghis Khan. His clan was Besud, which belonged to the Taichud tribe, which was at the time of Genghis Khan under Targudai Khiriltug's leadership....

 at the head of a small army sent to the south, intending to cut off any retreat by the Shah to that half of his kingdom. Further, Genghis and Tolui, at the head of an army of roughly 50,000 men, skirted Samarkand
Samarkand
Although a Persian-speaking region, it was not united politically with Iran most of the times between the disintegration of the Seleucid Empire and the Arab conquest . In the 6th century it was within the domain of the Turkic kingdom of the Göktürks.At the start of the 8th century Samarkand came...

 and went westwards to lay siege to the city of Bukhara
Bukhara
Bukhara , from the Soghdian βuxārak , is the capital of the Bukhara Province of Uzbekistan. The nation's fifth-largest city, it has a population of 263,400 . The region around Bukhara has been inhabited for at least five millennia, and the city has existed for half that time...

 first. To do this, they traversed the seemingly impassable Kyzyl Kum
Kyzyl Kum
The Kyzyl Kum , also called Qyzylqum, is the 11th largest desert in the world. Its name means Red Sand in Turkic languages. It is located in Central Asia in the doab between the rivers Amu Darya and Syr Darya, and is divided between Kazakhstan, Uzbekistan and Turkmenistan...

 desert by hopping through the various oases, guided most of the way by captured nomads. The Mongols arrived at the gates of Bukhara virtually unnoticed. Many military tacticians regard this surprise entrance to Bukhara one of the most successful surprise attacks in warfare.

Bukhara was not heavily fortified, with a moat and a single wall, and the citadel typical of Khwarezmi cities. The Bukharan garrison was made up of Turkish soldiers and led by Turkish generals, who attempted to break out on the third day of the siege. The break-out force, of perhaps 20,000 men, was annihilated in open battle. The city leaders opened the gates to the Mongols, though a unit of Turkish defenders held the city's citadel for another twelve days. Survivors from the citadel were executed, artisans and craftsmen were sent back to Mongolia, young men who had not fought were drafted into the Mongolian army and the rest of the population was sent into slavery. As the Mongol soldiers looted the city, a fire broke out, razing most of the city to the ground. Genghis Khan had the people assemble in the main mosque of the town, where he declared that he was the flail of God, sent to punish them for their sins before ordering their execution.

After the fall of Bukhara, Genghis headed to the Khwarezmi capital of Samarkand and arrived in March 1220. Samarkand possessed significantly better fortifications and as many as 100,000 men defending. As Genghis began his siege, his sons Chaghatai
Chagatai Khan
Chagatai Khan was the second son of Genghis Khan and first khan and origin of the names of the Chagatai Khanate, Chagatai language and Chagatai Turks....

 and Ögedei
Ögedei Khan
Ögedei Khan, born Ögedei was the third son of Genghis Khan and second Great Khan of the Mongol Empire by succeeding his father...

 joined him after finishing the reduction of Otrar, and the joint Mongol forces launched an assault on the city. The Mongols attacked using prisoners as body shields. On the third day of fighting, the Samarkand garrison launched a counterattack. Feigning retreat, Genghis drew a garrison force of 50,000 outside the fortifications of Samarkand and slaughtered them in open combat. Shah Muhammad attempted to relieve the city twice, but was driven back. On the fifth day, all but an approximate 2,000 soldiers surrendered. The remaining soldiers, die-hard supporters of the Shah, held out in the citadel. After the fortress fell, Genghis reneged on his surrender terms and executed every soldier that had taken arms against him at Samarkand. The people of Samarkand were ordered to evacuate and assemble in a plain outside the city, where they were killed and pyramids of severed heads raised as the symbol of Mongol victory.

About the time of the fall of Samarkand, Genghis Khan charged Subutai
Subutai
Subutai was the primary military strategist and general of Genghis Khan and Ögedei Khan...

 and Jebe, two of the Khan's top generals, with hunting down the Shah. The Shah had fled west with some of his most loyal soldiers and his son, Jalal al-Din, to a small island in the Caspian Sea
Caspian Sea
The Caspian Sea is the largest enclosed body of water on Earth by area, variously classed as the world's largest lake or a full-fledged sea. The sea has a surface area of and a volume of...

. It was there, in December of 1220, that the Shah died. Most scholars attribute his death to pneumonia, but others cite the sudden shock of the loss of his empire.

Meanwhile, the wealthy trading city of Urgench was still in the hands of Khwarezmian forces. Previously, the Shah's mother had ruled Urgench, but she fled when she learned her son had absconded to the Caspian Sea. She was captured and sent to Mongolia. Khumar Tegin, one of Muhammad's generals, declared himself Sultan of Urgench. Jochi, who had been on campaign in the north since the invasion, approached the city from that direction, while Genghis, Ögedei, and Chaghatai attacked from the south.

The assault on Urgench proved to be the most difficult battle of the Mongol invasion. The city was built along the river Amu Darya
Amu Darya
The Amu Darya , also called Oxus and Amu River, is a major river in Central Asia. It is formed by the junction of the Vakhsh and Panj rivers...

 in a marshy delta area. The soft ground did not lend itself to siege warfare, and there was a lack of large stones for the catapults. The Mongols attacked regardless, and the city fell only after the defenders put up a stout defense, fighting block for block. Mongolian casualties were higher than normal, due to the unaccustomed difficulty of adapting Mongolian tactics to city fighting.

The taking of Urgench was further complicated by continuing tensions between the Khan and his eldest son, Jochi, who had been promised the city as his prize. Jochi's mother was the same as his three brothers': Genghis Khan's teen bride, and apparent lifelong love, Borte. Only her sons were counted as Genghis's "official" sons and successors, rather than those conceived by the Khan's 500 or so other "wives and consorts." But Jochi had been conceived in controversy; in the early days of the Khan's rise to power, Borte was captured and raped while she was held prisoner. Jochi was born nine months later. While Genghis Khan chose to acknowledge him as his oldest son (primarily due to his love for Borte, whom he would have had to reject had he rejected her child), questions had always existed over Jochi's true parentage.

Such tensions were present as Jochi engaged in negotiations with the defenders, trying to get them to surrender so that as much of the city as possible was undamaged. This angered Chaghatai, and Genghis headed off this sibling fight by appointing Ögedei the commander of the besieging forces as Urgench fell. But the removal of Jochi from command, and the sack of a city he considered promised to him, enraged him and estranged him from his father and brothers, and is credited with being a decisive impetus for the later actions of a man who saw his younger brothers promoted over him, despite his own considerable military skills.

As usual, the artisans were sent back to Mongolia, young women and children were given to the Mongol soldiers as slaves, and the rest of the population was massacred. The Persian scholar Juvayni
Ata al-Mulk Juvayni
Atâ-Malek Jovayni was a Persian historian who wrote an account of the Mongol Empire entitled Ta' rīkh-i jahān-gushā .He was born in Juvain, a city in Khorasan in northeastern Iran...

 states that 50,000 Mongol soldiers were given the task of executing twenty-four Urgench citizens each, which would mean that 1.2 million people were killed. While this is almost certainly an exaggeration, the sacking of Urgench is considered one of the bloodiest massacres in human history.

This was the complete destruction of the city of Gurjang, south of the Aral Sea
Aral Sea
The Aral Sea was a lake that lay between Kazakhstan in the north and Karakalpakstan, an autonomous region of Uzbekistan, in the south...

. Upon its surrender the Mongols broke the dams and flooded the city, then proceeded to execute the survivors.

The Khorasan campaign

As the Mongols battered their way into Urgench, Genghis dispatched his youngest son Tolui
Tolui
Tolui, was the youngest son of Genghis Khan by his chief khatun Börte...

, at the head of an army, into the western Khwarezmid province of Khorasan. Khorasan had already felt the strength of Mongol arms. Earlier in the war, the generals Jebe and Subatai had travelled through the province while hunting down the fleeing Shah. However, the region was far from subjugated, many major cities remained free of Mongol rule, and the region was rife with rebellion against the few Mongol forces present in the region, following rumors that the Shah's son Jalal al-Din was gathering an army to fight the Mongols. Tolui's army consisted of somewhere around 50,000 men, which was composed of a core of Mongol soldiers (some estimates place it at 7,000), supplemented by a large body of foreign soldiers, such as Turks and previously conquered peoples in China and Mongolia. The army also included "3,000 machines flinging heavy incendiary arrows, 300 catapults, 700 mongonels
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...

 to discharge pots filled with naphtha
Naphtha
Naphtha normally refers to a number of different flammable liquid mixtures of hydrocarbons, i.e., a component of natural gas condensate or a distillation product from petroleum, coal tar or peat boiling in a certain range and containing certain hydrocarbons. It is a broad term covering among the...

, 4,000 storming-ladders, and 2,500 sacks of earth for filling up moats." Among the first cities to fall was Termez
Termez
Termez is a city in southern Uzbekistan near the border with Afghanistan.Some link the name of the city to thermos, "hot" in Greek, tracing its name back to Alexander the Great. Others suggest that it came from Sanskrit taramato, meaning "on the river bank". It is the hottest point of Uzbekistan...

 then Balkh
Balkh
Balkh , was an ancient city and centre of Zoroastrianism in what is now northern Afghanistan. Today it is a small town in the province of Balkh, about 20 kilometers northwest of the provincial capital, Mazar-e Sharif, and some south of the Amu Darya. It was one of the major cities of Khorasan...

. The major city to fall to Tolui's army was the city of Merv
Merv
Merv , formerly Achaemenid Satrapy of Margiana, and later Alexandria and Antiochia in Margiana , was a major oasis-city in Central Asia, on the historical Silk Road, located near today's Mary in Turkmenistan. Several cities have existed on this site, which is significant for the interchange of...

. Juvayni wrote of Merv: "In extent of territory it excelled among the lands of Khorasan, and the bird of peace and security flew over its confines. The number of its chief men rivaled the drops of April rain, and its earth contended with the heavens."

The garrison at Merv was only about 12,000 men, and the city was inundated with refugees from eastern Khwarezmia. For six days, Tolui besieged the city, and on the seventh day, he assaulted the city. However, the garrison beat back the assault and launched their own counter-attack against the Mongols. The garrison force was similarly forced back into the city. The next day, the city's governor surrendered the city on Tolui's promise that the lives of the citizens would be spared. As soon as the city was handed over, however, Tolui slaughtered almost every person who surrendered, in a massacre possibly on a greater scale than that at Urgench. After finishing off Merv, Tolui headed westwards, attacking the cities of Nishapur
Nishapur
Nishapur or Nishabur , is a city in the Razavi Khorasan province in northeastern Iran, situated in a fertile plain at the foot of the Binalud Mountains, near the regional capital of Mashhad...

 and Herat
Herat
Herāt is the capital of Herat province in Afghanistan. It is the third largest city of Afghanistan, with a population of about 397,456 as of 2006. It is situated in the valley of the Hari River, which flows from the mountains of central Afghanistan to the Karakum Desert in Turkmenistan...

. Nishapur fell after only three days; here, Tokuchar, a son-in-law of Genghis was killed in battle, and Tolui put to the sword every living thing in city, including the cats and dogs, with Tokuchar's widow presiding over the slaughter. After Nishapur's fall, Herat surrendered without a fight and was spared. Bamian in the Hindukush was another scene of carnage, here stiff resistance resulted in the death of a grandson of Ghengis. Next were the cities of Toos
Toos
Toos is a former municipality in the canton of Thurgau, Switzerland.In 1964 it was merged into Schönholzerswilen in the district of Münchwilen....

 and Mashad. By spring 1221, the province of Khurasan
Greater Khorasan
Greater Khorasan or Ancient Khorasan is a historical region of Greater Iran mentioned in sources from Sassanid and Islamic eras which "frequently" had a denotation wider than current three provinces of Khorasan in Iran...

 was under complete Mongol rule. Leaving garrison forces behind him, Tolui headed back east to rejoin his father.

The final campaign and aftermath

After the Mongol campaign in Khurasan, the Shah's army was broken. Jalal al-Din, who took power after his father's death, began assembling the remnants of the Khwarezmid army in the south, in the area of Afghanistan
Afghanistan
Afghanistan , officially the Islamic Republic of Afghanistan, is a landlocked country located in the centre of Asia, forming South Asia, Central Asia and the Middle East. With a population of about 29 million, it has an area of , making it the 42nd most populous and 41st largest nation in the world...

. Genghis had dispatched forces to hunt down the gathering army under Jalal al-Din, and the two sides met in the spring of 1221 at the town of Parwan. The engagement was a humiliating defeat for the Mongol forces
Battle of Parwan
The Battle of Parwan was fought between sultan Jalal ad-Din Mingburnu of the Khwarezmid Empire and the Mongols in 1221.Following the Mongol invasion of Khwarezm Jalal ad-Din was forced to flee towards the Hindukush, where he began to muster additional troops to face the Mongols...

. Enraged, Genghis headed south himself, and defeated Jalal al-Din on the Indus River
Battle of Indus
The Battle of Indus was fought at the river Indus in today's Pakistan in the year 1221 between Jalal ad-Din Mingburnu, the sultan of the Khwarezmid Empire and his only remaining forces of five thousand, and the Mongolian horde of Genghis Khan....

. Jalal al-Din, defeated, fled to India. Genghis spent some time on the southern shore of the Indus searching for the new Shah, but failed to find him. The Khan returned northwards, content to leave the Shah in India.

After the remaining centers of resistance were destroyed, Genghis returned to Mongolia, leaving Mongolian garrison troops behind. The destruction and absorption of the Khwarezmid Empire would prove to be a sign of things to come for the Islamic world, as well as Eastern Europe.
The new territory proved to be an important stepping stone for Mongol armies under the reign of Genghis' son Ögedei to invade Kievan Rus'
Kievan Rus'
Kievan Rus was a medieval polity in Eastern Europe, from the late 9th to the mid 13th century, when it disintegrated under the pressure of the Mongol invasion of 1237–1240....

 and Poland, and future campaigns brought Mongol arms to Austria, 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...

 and Germany. For the Islamic world, the destruction of Khwarezmid left Iraq, Turkey and Syria wide open. All three were eventually subjugated by future Khans.

The war with Khwarezmia also brought up the important question of succession. Genghis was not young when the war began, and he had four sons, all of whom were fierce warriors and each with their own loyal followers. Such sibling rivalry almost came to a head during the siege of Urgench, and Genghis was forced to rely on his third son, Ögedei, to finish the battle. Following the destruction of Urgench, Genghis officially selected Ögedei to be successor, as well as establishing that future Khans would come from direct descendants of previous rulers. Despite this establishment, the four sons would eventually come to blows, and those blows showed the instability of the Khanate that Genghis had created.

Jochi never forgave his father, and essentially withdrew from further Mongol wars, into the north, where he refused to come to his father when he was ordered to. Indeed, at the time of his death, the Khan was contemplating a march on his rebellious son. The bitterness that came from this transmitted to his sons, and especially grandsons, Batu
Batu Khan
Batu Khan was a Mongol ruler and founder of the Ulus of Jochi , the sub-khanate of the Mongol Empire. Batu was a son of Jochi and grandson of Genghis Khan. His ulus was the chief state of the Golden Horde , which ruled Rus and the Caucasus for around 250 years, after also destroying the armies...

 and Berke Khan, (of the Golden Horde
Golden Horde
The Golden Horde was a Mongol and later Turkicized khanate that formed the north-western sector of the Mongol Empire...

) who would conquer Kiev Rus, and the Russian States, brought open warfare to the empire, and its fall. When the Mamluks of Egypt managed to inflict one of history's more significant defeats on the Mongols at the Battle of Ain Jalut
Battle of Ain Jalut
The Battle of Ain Jalut took place on 3 September 1260 between Mamluks and the Mongols in eastern Galilee, in the Jezreel Valley, not far from Ein Harod....

 in 1260, Hulegu Khan, one of Genghis Khan's grandsons by his son Tolui
Tolui
Tolui, was the youngest son of Genghis Khan by his chief khatun Börte...

, who had sacked Baghdad in 1258, was unable to avenge that defeat when Berke Khan, his cousin, (who had converted to Islam) attacked him in the Transcaucasus to aid the cause of Islam, and Mongol battled Mongol for the first time. The seeds of that battle began in the war with Khwarezmia when their fathers struggled for supremacy.

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