Mk.1 "Female" British Tank a super little diorama from modelling friend  Francesco Senatore 

British heavy tanks were a series of related armoured fighting vehicles developed by the UK during the First World War. The Mark I was the world's first tank, a tracked, armed, and armoured vehicle, to enter combat. The name "tank" was initially a code name to maintain secrecy and disguise its true purpose by making it appear to be a water transport vehicle for bringing water to the troops at the front line. The tank was developed in 1915 to break the stalemate of trench warfare. It could survive the machine gun and small-arms fire in "No Man's Land", travel over difficult terrain, crush barbed wire, and cross trenches to assault fortified enemy positions with powerful armament. Tanks also carried supplies and troops.

The first tanks were known as the Mark I after the subsequent designs were introduced. Mark Is that were armed with two 6 pounder guns and three .303 Hotchkiss machine guns were called "Male" tanks; those with four Vickers machine guns and one Hotchkiss were called "Female". Ernest Swinton is credited with inventing the terms. To aid steering, a pair of large wheels were added behind the tank. These were not as effective as hoped and were subsequently dropped.

The subsequent Mark II, III, IV, and V, and later tanks, all bear a strong resemblance to Mother.