Today in World War II History—Sept. 6, 1942 POSTED: Wednesday, September 6, 2017 by Sarah Sundin Australian troops after battle of Isurava in Owen Stanleys, September 1942 (Australian War Memorial) 75 Years Ago—Sept. 6, 1942: In the Owen Stanley Mountains on New Guinea, Australians fall back to the Efogi Spur.