Elements of the 7th Infantry Division first saw combat in the amphibious assault on Attu Island, the westernmost Japanese entrenchment in the Aleutian islands chain. Elements landed on 11 May 1943, spearheaded by the 17th Infantry Regiment, and fought an intense battle over the tundra against strong Japanese resistance. The fight for the island culminated in a battle at Chichagof Harbor, when the division destroyed all Japanese resistance on the island on 29 May, after a suicidal Japanese bayonet charge. During its first fight of the war, 600 soldiers of the division were killed, while killing 2,351 Japanese and taking 28 prisoners.