The Japanese attack on Pearl Harbor on December 7, 1941, resulted in the deaths of 2,403 Americans and the injury of another 1,178. The surprise assault caused significant damage to the US Pacific Fleet, with 21 ships sunk or damaged, including 8 battleships. Additionally, more than 300 aircraft were destroyed or damaged during the attack. The attack prompted the United States to formally enter World War II and marked a turning point in the conflict.