07 Dec 1941, ~0800: The USS Arizona was sunk by Japanese B5N bombers while moored in Pearl Harbor, Hawaii. Eleven other ships were also sunk during the attack and numerous US aircraft were destroyed. The USA suffered 3581 casualties as a result of the attack. Japanese losses were minimal. The Japanese attack on Pearl Harbor was a tactical success, but led to the USA formally entering WW II, an event that significantly changed the course of the war.