“My great grand uncle Leo Patrick Cunningham is in this photo, lying on the stretcher after being shot through his left shoulder in France at the Battle of Flers-Courcelette (The Somme Offensive) in 1916. He was fighting with the Canadian Expeditionary Force, 18th Battalion.” Via Joe Welch at Twitter. I believe his grand uncle is the man facing the camera.
Obituary from January 1958. He passed on January 1, 1958 at Ste. Catharines, Ontario. Source: @Joel_Welch