Investigation of the Pearl Harbour attack

On Sunday morning, December 7, 1941, the United States and Japan were at peace. At 7:55 a.m. (Hawaiian time) over 300 Japanese planes attacked the island of Oahu and the American Pacific Fleet at Pearl Harbor. In less than two hours U.S. military and naval forces suffered a total of 3,435 casualties and the loss of or severe damage to 188 planes, eight battleships, three light cruisers, and four miscellaneous vessels.