Inside a Mark I tank Discover what made it so deadly

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Created as a solution to trench warfare, the Mark I tank heralded a new era of armed conflict

The world’s fi rst ever combat tank, the Mark I has been entrenched in military history and the human consciousness for reasons both good and bad. With its unique rhomboid-shape design, progressive adoption of caterpillar tracks and ability to deliver massive fi repower and armour in a mobile unit, it is celebrated as a great technical achievement that broke the domination of trench warfare.
However, it is also remembered as the invention that led many men to die in the most horrendous of manners, both enemy and ally alike, either mown down by its awesome fi repower, or entombed in its hot, smoky innards, incinerated when its armour was breached. Technically, for the time its design and mechanics were revolutionary, but they came at the cost of an additional fatal separation between cause and effect – no longer were battles fought between men, they were fought between men and machines.


The Mark I was powered by a Daimler sixcylinder, 13-litre capacity engine. Despite its large size, however, the engine was only capable of producing 105 brake horsepower and despite it being chosen for its reliability, because it was fi tted in the same compartment of the tank as the rest of the crew, the fumes, noise and heat it produced made conditions incredibly challenging. The engine was initiated by four members of the crew winding a huge crank handle (similar to those on early fi ghter planes) and was cooled by water.
As for weapons, the primary, malevariant of the Mark I was mounted with two six-pounder naval guns, one in each sponson (rotatable turret-like structures on its sides), as well as three light machine guns. The lighter female variant of the Mark I was fi tted with two heavy Vickers machine guns instead of the six-pounders. The Hotchkiss six-pounder naval guns had a range of 6,860 metres (22,500 feet) and were aimed with basic telescopic sights by their gunners. Each Mark I carried 334 shells.


In terms of defence, the thickness of the Mark I’s armour varied over its chassis. In crucial areas such as the front for example, it was 10mm thick, however elsewhere such as the rear, it was only a slight 6mm thick. This meant that while the tank could not be breached by small arms fi re and shrapnel, any direct shell or mortar hit would likely breach its resistance threshold. As the First World War progressed, however, the creation of harder, armour-piercing bullets reduced the effectiveness of the armour.
Controlling the Mark I was an epic task, requiring four crew members working in unison. One driver operated the brakes, the other driver meanwhile operated the primary gearbox. Track control was then independently operated by the unit’s two gear men. Compounding this was the fact that inside the tank the noise of the engine was deafening, meaning that communication had to be conducted using both sign language and Morse code.
The statistics…
Mark I tank
Crew: 8
Length: 9.8m (32ft)
Width: 4.2m (13.7ft)
Height: 2.4m (8.8ft)
Weight: 28 tons
Armour: 5.8-11.9mm
Fuel capacity: 227.3 litres
Max speed: 6.5km/h (4mph)
Armament: Two six-pounder
(57mm) naval guns, four 7.62mm
Hotchkiss air-cooled machine guns

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