Details from the 1st Battalion were called out on service on 26 August 1939 and then placed on active service on 1 September 1939, under the designation 1st Battalion, The Canadian Scottish Regiment, CASF (Details), for local protection duties. Details from the 2nd Battalion were placed on active service on 1 September 1939, under the designation 2nd Battalion, The Canadian Scottish Regiment (Machine Gun), CASF (Details), for local protection duties. Details from the 62nd Field Battery, RCA were placed on active service on 1 September 1939, under the designation 62nd Field Battery (H), RCA, CASF (Details), for local protection duties. These details were disbanded on 31 December 1940.