Fort Walsh is a National Historic Site of Canada that was a North-West Mounted Police (NWMP) fort and the site of the Cypress Hills Massacre. Administered by Parks Canada, it forms a constituent part of Cypress Hills Interprovincial Park. Assiniboine chiefs Man Who Takes the Coat, Long Lodge, and Lean Man signed adhesion to Treaty 4 at the fort on September 25, 1877. Fort Walsh served as the NWMP headquarters from 1878 to 1882. In 1883 the fort was closed and dismantled.