 This company mustered at Camp Valcartier to be formed into a battalion with companies from three other Canadian highland regiments, the 16th Battalion (Canadian Scottish), CEF.The Camerons next mobilized the Second Volunteer Overseas Company providing the second-in-command, Major D. S. MacKay, a company (10 officers, 250 other ranks) and a signals section for what would become the 27th (City of Winnipeg) Battalion (The Royal Winnipeg Rifles).It would not be until December 1914 that the regiment would be permitted to raise an entire battalion for overseas service.