in a defensive square, principally trading in caribou hides and white fox and marten pelts. Erlandson ultimately discovered bountiful trapping far to the south in the highlands around Lake Petitsikapau; he briefly succeeded Finlayson as acting factor but was replaced when a brig delivered John McLean to his new post in 1837. Over the next four years, he succeeded in establishing an efficient riverine connection with Fort Smith on Lake Melville, but the trade at Chimo itself was so sparse that the trails they found were simply used to supply Fort Naskaupi in the rich interior. In the winter of 1840–1841, fish and game were so scarce that the agents were forced to scatter into open camps around the countryside to survive as best they could. Fort Chimo and its District of Ungava were shuttered on September 1, 1843, an HBC ship carting away the remaining men and supplies. The fort did not reopen until 1866, when it was thought necessary to curtail the trade going to the Moravians in the area and the steamboat Labrador made resupplying the distant outpost easier. At that time, Inuit, Innu (Montagnais), and Naskapi came to trade at the post. By the 1950s, Fort Chimo included two dormitories, two warehouses, oil and salt sheds, and carpentry, cooperage, and machinist workshops. A sloop, a steamer, and outposts at the mouths of the Whale and George Rivers helped carry out the salmon catch each August, which was salted on site for use, sale, and export. The fort was usually supplied by the steamer Eric, while a smaller refrigerated steamer picked up the salmon haul. Amid the Second World War, the United States Army Air Forces (USAAF) surveyed the area from amphibious aircraft out of Gander on July 12, 1941 and established the Crystal 1 weather station on the western shore of the Koksoak on October 10, 1941. It was supplied by the United States Coast Guard. An airfield was established in the summer of 1942, although it was never used for the Crimson East's intended purpose of facilitating trans-Atlantic ferry flights. The US turned over the base to the Canadian government in 1944 and 1945, which established Naval Radio Station Chimo (call sign CFI) as part of the Canadian Supplementary Radio Activities (SUPRAD) system in 1948. Direction-finding facilities were finished and commenced operations in 1949. In 1950, it became part of the Atlantic high-frequency radio direction