Casualties in the First World War devastated the Legion of Frontiersmen, and except for a brief resurgence in the interwar period, a series of schisms and sectarianism prevented attempts to reinvigorate the movement. In the late 1930s, the Legion of Frontiersmen in Canada was formally affiliated with the Royal Canadian Mounted Police, but after a schism split within the Canadian Frontiersmen, the RCMP severed formal ties. Various Legion of Frontiersmen groups still exist throughout the Commonwealth, but as a whole, it has been unable to define its niche post World War II, and is becoming increasingly irrelevant in the modern world.