text:  and take on a defensive role so that Germany's tanks tended to grow during the war and then grow some more and then grow some more until they doubled and then doubled again in size and the armament went up from 50 caliber machine guns to 75 millimeter cannon to 88 millimeter cannon and the armor thickness increased on them and they got bigger and bigger and bigger up to 68 tons and then even bigger than that and consequently they got less and less miles to the gallon