By 1914, the Canadian Corps of Guides totalled some 500 all ranks. Given that their mounted scout role appeared inappropriate for war in Europe, many of the personnel serving with the Corps of Guides were absorbed into existing units and formations in the Canadian Militia and Canadian Expeditionary Force. Others became intelligence staff officers and non-commissioned officers serving with the British Intelligence Corps. Some continued to serve in Canada with the Canadian Corps of Guides. The intelligence system created within the First Canadian Division prior to its deployment to France in 1915 served as the basis for the development of intelligence structures generally throughout the Canadian Corps.