Attack on Pearl Harbor
Overview
 
The attack on Pearl Harbor (called Hawaii Operation or Operation AI by the Japanese Imperial General Headquarters
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...

 (Operation Z in planning) and the Battle of Pearl Harbor) was a surprise military strike
Military strike
A military strike is a limited attack on a specified target. Strikes are used, amongst other things, to render facilities inoperable , to assassinate enemy leaders, and to limit supply to enemy troops. A strike can often be the prelude to a war or siege, whose initial strike is for a strategic or...

 conducted by the Imperial Japanese Navy
Imperial Japanese Navy
The Imperial Japanese Navy was the navy of the Empire of Japan from 1869 until 1947, when it was dissolved following Japan's constitutional renunciation of the use of force as a means of settling international disputes...

 against the United States naval base
Naval base
A naval base is a military base, where warships and naval ships are deployed when they have no mission at sea or want to restock. Usually ships may also perform some minor repairs. Some naval bases are temporary homes to aircraft that usually stay on the ships but are undergoing maintenance while...

 at Pearl Harbor
Pearl Harbor
Pearl Harbor, known to Hawaiians as Puuloa, is a lagoon harbor on the island of Oahu, Hawaii, west of Honolulu. Much of the harbor and surrounding lands is a United States Navy deep-water naval base. It is also the headquarters of the U.S. Pacific Fleet...

, Hawaii, on the morning of December 7, 1941 (December 8 in Japan). The attack was intended as a preventive
Preventive war
A preventive war or preventative war is a war initiated to prevent another party from attacking, when an attack by that party is not imminent or known to be planned. Preventive war aims to forestall a shift in the balance of power by strategically attacking before the balance of power has a chance...

 action in order to keep the U.S. Pacific Fleet from interfering with military actions the Empire of Japan
Empire of Japan
The Empire of Japan is the name of the state of Japan that existed from the Meiji Restoration on 3 January 1868 to the enactment of the post-World War II Constitution of...

 was planning in 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...

 against overseas territories of 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...

, 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...

, and the United States.

The base was attacked by 353 Japanese fighters, bombers and torpedo planes in two waves, launched from six aircraft carrier
Aircraft carrier
An aircraft carrier is a warship designed with a primary mission of deploying and recovering aircraft, acting as a seagoing airbase. Aircraft carriers thus allow a naval force to project air power worldwide without having to depend on local bases for staging aircraft operations...

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