The first Tetrarchs were delivered to the Army in November 1940 , and were initially deployed with the 1st Armoured Division ( which was being refitted after losing the majority of its previous tanks during the Battle of France ) and the newly formed 6th Armoured Division . However , the faults discovered with the Tetrarch cooling system precluded them from being integrated into units that were sent to the Middle East to participate in the North African Campaign . Shortly after , all light tanks were discarded from the establishments of British armoured divisions as not suitable for further service .