"84 & 87 C.T.S Collision in mid-air"
"87 C.T.S. Cadet killed"
One of the crashed aircraft was number C617. This accident took place on August 16th, 1917. The cadet who was killed was William Sidney Gallie, of Winnipeg.
Photos from an album that belonged to Christopher Paulus Devos, a sergeant in the Royal Flying Corps who was an instructor for 84 Canadian Training Squadron, based at Camp Mohawk, near Deseronto, Ontario.