The British Mark I was the first tank, entering service in World War I, born of the need to break the domination of trenches and machine guns over the battlefields of the Western Front. It, and subsequent variations, were the most successful heavy tanks of the war.

The Mark IV Male carried 4 Lewis machine guns as well as the two sponson guns
• Crew: 8
• Male: 28 tons (28.4 tonnes)
• Armour: .25-.47 in (6.1 - 12 mm)
• Armament: Two 6-pounders & Four .303 Lewis MG
• Ammo storage 6 pounder: 180 HE rounds and remainder Case