The Yukon Field Force was a unit of 203 officers and men from the Permanent Force of the Canadian Militia in formation from 1898 to 1900. The men of the unit comprised infantry, artillery, and cavalry and were based at Fort Selkirk with a detachment at Dawson City to support the Canadian government and the North-West Mounted Police in maintaining law and order during the Klondike Gold Rush. With eight out of ten people in the heart of the Yukon being American, this posed a real threat to the security and sovereignty of Canada.