Two Mk IV tanks, 1917 (c)

Photograph, World War One (1914-1918), 1917 (c).

The Mark IV was an up-armoured version of the Mark I tank. To improve safety, its fuel was also stored in a single external tank located between the rear track horns. The 'female' Mark IV (visible here with its side escape hatch open below the sponson) was armed with six .303 Lewis machine guns and the 'male' (the example shown is named 'HMLS Sir Reginald'), with two six pounder guns and four Lewis guns.

From an album of 128 photographs.