John lived at Homerton, Middlesex. He entered the war in Gallipoli on 9th August 1915. He was killed by shrapnel when assisting wounded in the trenches. The war diary of the 1/3rd East Anglian Field Ambulance (T.F.) noted on 16th August 1915: “The F. Amb. has had the misfortune to lose Capt. W R S Roberts and 260 Sgt. J Curson, both being killed by shrapnel when helping wounded in the trenches occupied by the 162nd Inf. Bde. The unit mourns the loss of those two brave comrades who fell in action whilst carrying out their arduous duty.” John's body could not be recovered.