5923013 ?R.E.?s mine and counter-mine Messines Ridge which dominated Ypres blown up and stormed, June 7th?, 1917 (b/w photo) by Unknown photographer, (20th century); National Army Museum, London; (add.info.: ?R.E.?s mine and counter-mine Messines Ridge which dominated Ypres blown up and stormed, June 7th?, 1917. Photograph, World War One, Western Front (1914-1918), 1917. Tunneling and mining operations were used to attack enemy positions by digging underneath them and then destroying them with explosive mines. Much of the excavation work was done by special Royal Engineers units formed from Welsh and Durham miners. Sometimes miners would meet and fight German tunnelers underground as their tunnels intercepted enemy works. From a collection of 101 stereoscopic photographs entitled ?The Great War?.); by National Army Museum .