During World War II, some Papuan men enlisted in the Papua Infantry Battalion and others as carriers over trails and rough terrains (porters) as supply support to Allied and Japanese armies during long jungle marches. Historian William Manchester outlines in his biography of General Douglas MacArthur, ''American Caesar'', that acting as porters was well down the natives' list of acceptable voluntary activities and that they would fade away without great inducements. Many Papuan residents of Port Moresby either returned to their family villages or were evacuated to camps when the threat of Japanese invasion loomed. By September 1942, the city was an important Allied complex of bases, and thousands of troops were stationed in the area or more often, staged through it, as it was the last Allied bastion on the island and, conversely, a key staging and jumping off point as the Allies began conducting offensive warfare themselves, pushing back the Japanese advances. General MacArthur located his headquarters in Port Moresby from November 1942 to October 1944.