 The regiment was equipped with the 5.5-inch medium gun/howitzer, later converting to the 4.5-inch Gun (Canadian Specification).In March 1942, the 3rd Medium was assigned to I Canadian Corps in England; in July 1944, the unit was transferred to II Canadian Corps for service in Northwest Europe.It was later assigned to the First Canadian Army level of command under 2 Army Group RCA (2nd AGRCA).