 Complete the following phrase:  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 of Alaska. Elements landed on 11 May 1943, spearheaded by the 17th Infantry Regiment. The initial landings were unopposed, but Japanese forces mounted a counteroffensive the next day, and the 7th Infantry Division fought an 