The 34th Field Battery, RCA, and the 32nd (Kingston) Field Battery, RCA, mobilized the 32nd/34th Field Battery, RCA, CASF, for active service on 24 May 1940. This unit was subsequently reorganized as two separate batteries on 1 January 1941, designated as the 32nd (Kingston) Field Battery, RCA, CASF, and the 34th Field Battery, RCA, CASF. On D-Day, 6 June 1944, it landed in Normandy, France, as part of the 14th Field Regiment, RCA, CASF, which fought as a unit of the 3rd Canadian Infantry Division in North-West Europe until the end of the war. The overseas battery was disbanded on 2 November 1945. The battery later mobilized the 2nd/34th Field Battery, RCA, CAOF, on 1 June 1945 for service with the Canadian Army Occupation Force in Germany. This battery was disbanded on 28 March 1946.