5924333 When the thaw set in on the Somme, our artillery ploughs its way through mud and water to Gommecourt\', 1916 (b/w photo) by Unknown photographer, (20th century); National Army Museum, London; (add.info.: \'When the thaw set in on the Somme, our artillery ploughs its way through mud and water to Gommecourt\', 1916. Stereoscopic photograph, World War One, Western Front (1914-1918), 1916. During the Battle of the Somme (1916) the British fired over 15 million shells. Of those, some 10 million were fired by 18-pounders. With an experienced crew and in good conditions, the 18-pounder could fire at a remarkable 30 rounds a minute. One of 100 stereoscopic photographs.); by National Army Museum ; out of copyright.