British tank amid the ruins of Bapaume...', 1918.

British tank amid the ruins of Bapaume…’, 1918.

Mk 1 tank during training at Elveden, Suffolk, 1916.

Mk 1 tank during training at Elveden, Suffolk, 1916.

Mark I tank, 'C19', 'Clan Leslie', 1916.

Mark I tank, ‘C19’, ‘Clan Leslie’, 1916.

British Mark IV female tank during trials, 1917.

British Mark IV female tank during trials, 1917.

Mark IV female captured late December 1917'.

Mark IV female captured late December 1917′.

A Mark I tank surrounded by troops of 122nd Brigade, 1916.

A Mark I tank surrounded by troops of 122nd Brigade, 1916.