Pearl Harbor is located in Hawaii on the island of O’ahu. During the time of World War ll, Hawaii was not a state, but a US territory. Before the attack World War ll had been raging in Europe and Asia for two years, but the United States had not entered the war. The attack on Pearl Harbor came as a complete surprise. There were two waves of attacks and by the end of the second wave a number of US ships were destroyed. Here are the casualties from both sides during the attack. They destroyed a lot of fighter planes and aircraft at the base.