He was a soldier in WWI, regimental #442329. Ref #RG 150, Box 456-11 shows him as 5' 10" tall, fair complexion, blue eyes, light brown hair, 2 vacination marks on left arm, fit for CEF (Canadian Expeditionary Forces), a banker.
The National Archives of the United kingdom holds a Medal card for Barnum, James Bernard Mockridge. Corps: 30th Battalion; Regiment No: Canadian Infantry; Rank: 442329 Private; Date 1914-1920; Catalogue reference WO 372/2; Dept Records created or inherited by the War Office, Armed Forces, Judge Advocate General, and related bodies; Series War Office: Service Medal and Award Rolls; Index, First World War; Piece: Barnes C E - Boundy C E. Image contains 1 medal card of many for this collection.
Birth reg #019947.