The Pearl Harbor Raid was a surprise attack by the Imperial Japanese Navy Air Service against the naval base at Pearl Harbor, Honolulu, Hawaii on December 7th, 1941. The raid directly resulted in the formal entry of the United States (who had been neutral until this point) into World War II the next day.
The attack was intended by the Japanese military as a preventative action to stop the United States Pacific Fleet from interfering with its planned military actions in Southeast Asia against overseas territories of the United Kingdom, the Netherlands, and the United States.
Starting at 7:48 a.m. Hawaiian Time, the base at Pearl Harbour was attacked by 353 Imperial Japanese aircraft in two waves, launched from six aircraft carriers. Of the eight U.S. Navy battleships present, four were sunk and all were damaged. The Japanese also sank or damaged three cruisers, three destroyers, an anti-aircraft training ship, and one minelayer. A total of 188 U.S. aircraft were destroyed; 2,403 Americans were killed and 1,178 others were wounded. Japanese losses were light: 29 aircraft and five midget submarines lost, and 64 servicemen killed.