Hitler was impressed with Allied heavy tanks and in 1941 ordered his own. In late 1942 Tiger I’s appeared, bigger and better and had a massive 88mm main gun with greatly improved armor. In 1944 the Tiger II, a larger tank arrived with an upgraded 88mm and armor that was almost impenetrable making it the most powerful tank of WWII. Just the sight of a Tiger II caused fear but they were too few and too late. The Tiger’s biggest enemy was lack of fuel and mechanical breakdown.