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William McCaig - British Army WWI Service Record
Princess Louise's (Argyll and Sutherland Highlanders) Regiment

Source: British Army WWI Service Records, 1914-1920, [database and digital images on-line], orig source: The National Archives of the UK (TNA): Public Record Office (PRO). War Office: Soldiers’ Documents, First World War ‘Burnt Documents’ (Microfilm Copies); (The National Archives Microfilm Publication WO363); Records created or inherited by the War Office, Armed Forces, Judge Advocate General, and related bodies; The National Archives of the UK (TNA), Kew, Surrey, England.