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In page Armoured fighting vehicle:

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The armoured personnel carrier, designed to transport infantry troops to the frontline, emerged towards the end of World War I. During the first actions with tanks, it had become clear that close contact with infantry was essential in order to secure ground won by the tanks. Troops on foot were vulnerable to enemy fire, but they could not be transported in the tank because of the intense heat and noxious atmosphere.[citation needed] In 1917, Lieutenant G. J. Rackham was ordered to design an armoured vehicle that could fight and carry troops or supplies. The Mark IX tank was built by Armstrong, Whitworth & Co., although just three vehicles had been finished at the time of the Armistice in November 1918, and only 34 were built in total.