A column of 18 Pounder QF Mark 1 guns, 1916 (c).

A column of 18 Pounder QF Mark 1 guns on a road in France, 1916 (c). The 18-pounder was the main British artillery weapon of the First World War. With a crew of ten men, it could fire 18-pound shrapnel, high explosive or smoke shells up to six kilometres (over 6,500 yards). 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. From a collection of 23 official photographs by Press Photographer Bayley Harrison, World War One, Western Front (1914-1918).