William entered the war in France on 5th November 1914. He was serving with the 141st Field Ambulance when he was admitted 'sick' into the hospital of the unit on 29th June 1918, and evacuated to a Casualty Clearing Station. He rejoined his unit for duty on 1st March 1918. On 30th March 1918 he was admitted 'sick' again to hospital of his unit, then discharged on 1st April 1918.