Shoulder title Seaforth Highlanders of Canada, 1st Canadian Division (canvas)

The regiment mobilized The Seaforth Highlanders of Canada, CASF for active service on 1 September 1939. It was redesignated as the 1st Battalion, The Seaforth Highlanders of Canada, CASF on 7 November 1940. It embarked for Britain on 20 December 1939. The battalion landed in Sicily on 10 July 1943 and in Italy on 4 September 1943 as part of the 2nd Brigade, 1st Canadian Infantry Division. On 14 March 1945, it moved with the 1st Canadian Corps to North-West Europe as part of |OPERATION GOLDFLAKE, where it fought until the end of the war. The overseas battalion disbanded on 31 October 1945.^[1]

On 1 June 1945, a second Active Force component of the regiment was mobilized for service in the Pacific theatre of operations designated as the 2nd Canadian Infantry Battalion (The Seaforth Highlanders of Canada), CASF.21 The battalion disbanded on 1 November 1945.