On Sunday, December 7th, 1941 the Japanese launched a surprise attack against the U.S. Forces stationed at Pearl Harbour , Hawaii By planning this attack on a Sunday, the Japanese commander Admiral Nagumo, hoped to catch the entire fleet in port. As luck would have it, the Aircraft Carriers and one of the Battleships were not in port. (The USS Enterprise was returning from Wake Island , where it had just delivered some aircraft. The USS Lexington was ferrying aircraft to Midway, and the USS Saratoga and USS Colorado were undergoing repairs in the United States ..)