Formed during the First World War in August 1914, the 1st Canadian Division was a formation of the Canadian Expeditionary Force. The division was initially made up from provisional battalions that were named after their province of origin but these titles were dropped before the division arrived in Britain on 14 October 1914. Following the war, the division was stood down only to be re mobilized as a formation on 1 September 1939 as the 1st Canadian Infantry Division for service in the Second World War.