Panzer VIII Maus
Panzerkampfwagen VIII Maus ("Mouse") was a German World War II super-heavy tank completed in late 1944. It is the heaviest fully enclosed armoured fighting vehicle ever built. Five were ordered, but only two hulls and one turret were completed before the testing grounds were captured by advancing Soviet military forces.
Tanks in the British Army
The Mark VI did not progress past the stage of a wooden mock-up; the project was cancelled in December 1917 in order that a tank co-developed with the US (the Mark VIII) could go forward. Because of technical troubles the Mark VII, almost identical to Mks I to V, had only three produced out of an order for 74 when war ended. The Mark VIII was a cooperative design between the Allies and was also known as "Liberty," "International," or Anglo-American tank. It did not see combat in the war but was used and upgraded until the 1930s when given to Canada for training. The Mark IX was designed in 1917 as the world's first specialised Armoured Personnel Carrier (APC). Thirty-four were completed, but none saw service. One was experimentally equipped as an armoured ambulance, and another rebuilt as an amphibious tank by the staff of the test base at Dollis Hill. There is photographic evidence that some Mk IX were used post-WWI as Infantry Carriers, but no record of their peacetime service is known to exist. The Mark X, a further improvement on the Mk V, was planned but never built.
The Medium Mark A Whippet was a British tank of the First World War. It was intended to complement the slower British heavy tanks by using its relative mobility and speed in exploiting any break in the enemy lines.
The Whippet tanks arrived late in the First World War, and went into action in March 1918. Alongside Mark V and V* tanks, they took part in the Amiens offensive (8 August 1918) where they broke through into the German rear areas causing the loss of the artillery in an entire front sector.