‘Enemy seen, Fire! Pulling the trigger of a trench mortar,’ 1916 circa (b/w photo)

‘Enemy seen, Fire! Pulling the trigger of a trench mortar - the shell on its deadly flight in mid-air,’ 1916 circa. Photograph, World War One, Western Front, 1916 circa. A mortar is essentially a short tube designed to fire a projectile at a steep angle so that it falls straight down on the enemy. Such weapons were ideally suited for trench warfare, especially where the lines of the combatants were very close together. As this image demonstrates, mortars could also be fired from the relative safety of the trench. From a collection of 101 stereoscopic photographs entitled ‘The Great War’.