Tortoise heavy assault tank

The Tank, Heavy Assault, Tortoise (A39) was a British heavy assault tank design developed in World War II but never put into mass production. It was developed for the task of clearing heavily fortified areas and as a result favoured armour protection over mobility.

Although heavy, at 78 tons, and not readily transported, it was reliable and a good gun platform.

Development
In the early part of 1943 the Allied forces anticipated considerable resistance in the projected future invasion of Europe, with the enemy fighting from heavily fortified positions such as the Siegfried Line. As a result, a new class of vehicles emerged, in the shape of Assault tanks, which placed maximum armour protection at a higher priority than mobility. Initially, work was concentrated on the Excelsior tank (A33), based on the Cromwell tank. There was also a program to upgrade the armour of the Churchill tank. For similar work in the Far East, the Valiant tank (A38), based on the Valentine tank was considered although weight was specified to be as low as possible.

The Secretary of State for War and the Minister of Supply issued a Joint Memorandum in April 1943 which gave a vague specification for an Assault tank, classing it as a special purpose vehicle to operate in heavily defended areas as part of the specialist 79th Armoured Division.

The Nuffield Organisation responded with 18 separate designs (AT1 through AT18) drafted between May 1943 and February 1944, each design larger and heavier than the last. By February 1944 design AT16 was complete and was approved by the Tank Board who proposed that month that 25 be produced directly from the mockup stage without bothering with a prototype, to be available for operational service in September 1945. An order for 25 was placed by the War Office and work was begun.

Following the end of the war the order was reduced and only six vehicles were built. One example was sent to Germany for trials where it was found to be mechanically reliable and a powerful and accurate gun platform. However, at a weight of 80 tons and a height of 10 ft it was extremely slow and proved difficult to transport.

Description
Since the Tortoise had a fixed casemate superstructure instead of a turret, it can be classified as a self-propelled gun or an assault gun and not a tank. The crew included a commander, driver, and gunner, with two loaders for the 32-pounder gun and two machine gunners.

Internally it was split into three compartments, the transmission to the front, the crew in the centre and the Rolls-Royce Meteor engine at the rear. The suspension consisted of four bogies on each side each of the hull. Each bogie had two pairs of wheels, with each pair linked to a transverse torsion bar. The Merritt-Brown transmission was fitted with an all speed reverse, giving approximately the same speed backwards as forwards.

Armament
The Ordnance QF 32 pounder gun design was adapted from the British 3.7 inch anti-aircraft gun. The ammunition used a separate charge and shell, the latter a 32 pound (14.5 kg) armour piercing shot (APCBC). In tests the gun was successful against a German Panther tank at nearly 1,000 yards.

The 32-pdr gun was mounted in a power-assisted limited traverse mounting; rather than being mounted on the more traditional trunnions, it protruded through a large ball mount in the front of the hull, protected by 225 mm armour. To the left of it was a Besa machine gun in an armoured ball mount. A further two Besa machine guns were mounted in a turret on the top of the hull to the right.

Survivors

 * One of the six prototype Tortoises has been preserved at the Bovington Tank Museum in Bovington, UK. The vehicle is in running condition. A 2011 overhaul saw it running under its own power for the first time since the 1950s. It was shown to the public in June 2011 at Tankfest 2011, the Bovington museum's annual display of running vehicles.
 * A Tortoise, without its gun, lies on the Kirkcudbright military training area near Kirkcudbright, Scotland. Other damage to the tank and the designation of the Kirkcudbright training area as a Site of Special Scientific Interest mean that removal of the Tortoise to a museum is now unlikely.