The attack on Pearl Harbor was a pre-emptive military strike on the United States Pacific Fleet base at Pearl Harbor, Hawaii by the Empire of Japan's Imperial Japanese Navy, on the morning of Sunday, 7 December 1941. Two attack waves, totalling 350 aircraft, were launched from six IJN aircraft carriers which destroyed two U.S. Navy battleships, one minelayer, two destroyers and 188 aircraft. Personnel losses were 2,333 killed and 1,139 wounded. Damaged warships included three cruisers, a destroyer, and six battleships. Of those six, one was deliberately grounded and was later refloated and repaired. Two sank at their berths but were later repaired and both rejoined the fleet late in the war. Vital fuel storage, shipyards, and submarine facilities were not hit. Japanese losses were minimal at 29 aircraft and five midget submarines, with 65 Japanese servicemen killed or wounded.