After upkeep at Boston, she put to sea on 5 September to carry supplies to an Army base located at Ikateg Fjord, Greenland. Steaming via Argentia in Newfoundland and Angmagssalik on the eastern coast of Greenland, she made one false start and then, on her second attempt, successfully navigated Angmagssalik, Ikerrasak, and Ikateg fjords to arrive at the Army airstrip. She began unloading her cargo, an operation made doubly hazardous by large quantities of floating ice. In spite of the danger, "Yukon"s crew completed the unloading successfully, allowing the ship to leave before the imminent closing of the fjord by ice. She continued her voyage east, bound for Reykjavík, Iceland.