Question: What division of the American armed forces fought the Imperial Japanese Army, also know as the "Dai-Nippon Teikoku Rikugun", or "Army of the Greater Japanese Empire", at Bougainville during World War Two?
Sentence (from "Battle of Hellzapoppin Ridge and Hill 600A"): It resulted in the capture of the two positions by the Marines with the support of artillery and aircraft, and the withdrawal of the Japanese forces as the American perimeter, which had been established around Torokina, was expanded towards the Torokina River.
Relevant evidence: No