The 72nd Battalion (Seaforth Highlanders of Canada), CEF was authorized on 10 July 1915 and embarked for Britain on 23 April 1916. It disembarked in France on 13 August 1916, where it fought as part of the 12th Infantry Brigade, 4th Canadian Division in France and Flanders until the end of the war. The battalion disbanded on 30 August 1920
The 231st Battalion (Seaforth Highlanders of Canada), CEF was authorized on 15 July 1916 and embarked for Britain on 11 April 1917, where, on 22 April 1917, its personnel were absorbed by the 24th Reserve Battalion, CEF to provide reinforcements for the Canadian Corps in the field. The battalion disbanded on 11 April 1918.