After the war, the battalion disbanded, and in the 1920 reorganization of the Militia, in the wake of the work of the Otter Commission, a new regiment was created amalgamating the 50th Regiment and the Victoria Fusiliers and named "The Canadian Scottish Regiment." The suffix "(Princess Mary´s)" followed later.
The Canadian Scottish were unique in 1939 in having two battalions on the strength of the Canadian Militia. The 1st Battalion was mobilized for overseas service in 1940 and trained in Debert Nova Scotia until August 1941, from where it moved to the United Kingdom as part of the 3rd Canadian Infantry Division. On 6 June 1944 C Company was in the first wave ashore in Normandy on Juno Beach, the rest of the Battalion following in the second wave. The battalion proceeded to advance a total of six miles - farther than any other assault brigade of the British Second Army that day.