General Plumer, with white moustache, GOC British 2nd Army with, behind him, Major General Harington, his Chief of Staff, and, holding coat, Lieutenant General Byng, GOC Canadian Corps, standing on the lip of an 8,000lb mine exploded at a British training school at Wisques, France, 28 August 1916. Coordination of mines with attacks was a British weakness during 1915–1916 and Byng scaled down the use of mines at Vimy Ridge in April 1917. (Imperial War Museum Q4169).