Hudson's Bay Co. fort on south shore of Great Slave lake about 4 miles south of mouth Slave river. It was first built in 1815 and marked the most northerly operations of the Hudson's Bay Co. until after the union of 1821. After the union, the present fort was constructed on the site of the first fort. The first North West Co. fort on Slave lake was built by Cuthbert Grant and Leroux for Peter Pond in 1786 on the Slave river, left bank, a few miles from its mouth. This was called Slave Fort. A short time after, it was moved to Moose Deer Island, a few miles from the mouth of Slave river and opposite Fort Resolution. There the North West Co. remained until the coalition of 1821 when Slave fort was abandoned. Maps 8, 100, 101 and n25 (part 12).