 Les Fusiliers de Sherbrooke, in conjunction with The Sherbrooke Regiment (Machine Gun) (now The Sherbrooke Hussars), mobilized The Sherbrooke Fusiliers Regiment, CASF for active service on 24 May 1940.The name Fusilier was plural initially but subsequently changed to singular.It was redesignated as the 1st Battalion, The Sherbrooke Fusiliers Regiment, CASF on 7 November 1940 and as the 1st Battalion, The Sherbrooke Fusilier Regiment, CASF on 15 November 1940.