Metal Shoulder Title - 231st Battalion CEF (Canadian Expeditionary Force) WW I The 231st (Seaforth Highlanders of Canada) Battalion, CEF was a unit in the Canadian Expeditionary Force during the First World War. The 231st Battalion, which was authorized on 15 July 1916 as the '231st "Overseas" Battalion, CEF'. Based in Vancouver, British Columbia, the unit began recruiting in early 1916 in that city and the surrounding district. After sailing to England on 11 April 1917, the battalion was absorbed into the 24th Reserve Battalion on April 22, 1917 to provide reinforcements for the Canadian Corps in the field. The battalion was disbanded on 11 April 1918. The 231st Battalion, CEF had one Officer Commanding: Lt-Col. F. E. Leach.