 Complete the following phrase:  In late 1941, Portmar was chartered by the United States Department of War to carry supplies to the Philippines but due to the Japanese invasion of the Philippines was retained in Australia. She was used in February 1942 to carry reinforcements from Darwin for the defenders of Timor prior to the Japanese invasion. The reinforcement convoy was shadowed by Japanese planes and attacked, forcing its cancellation. Portmar returned to Darwin on 18 February, and was still in harbour the next day when Japanese carrier-based aircraft 