Mark A Whippet Tank - Wargaming - Flames Of War. Mark A Whippet Tank (GBR080). While the Mark I and later the Mark IV tanks were excellent infantry support weapons, and could even create a substantial breach in an enemy line when used in numbers, they lacked the speed to exploit that gap. In late 1916, William Tritton proposed a faster vehicle to the Landships Committee which would be capable of filling this role on the battlefield. The new vehicle, called the Medium Mark A or 'Whippet', was a radical departure from the heavier rhomboidal tanks. The caterpillar tracks, derived from the Little Willie prototype, were more conventional side-slung units as opposed to the all-around tracks of the Mark IV. Style and Colour May Vary. Ages 14+ We ship all orders in 3 working days. It will be delivered within 14-21 working days. More4littlestore is an offshore business located in the United Kingdom and orders may incur NZ customs duty or tax. Find out more at http://www.whatsmyduty.org.nz/