18-pounder in action at Authuille on the Somme, September 1916

Lantern slide, 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 a crew of ten men, it could fire 18-pound shrapnel, high explosive or smoke shells up to six kilometres (over 6,500 yards).

From a box of 50 lantern slides.