In fact, they were clearly inferior to most of the opposing tanks in terms of combat power and armor from the very beginning. However, the German armaments industry was unable to keep up with the production of the much stronger Panzerkampfwagen III and IV, which is why the Wehrmacht had to rely heavily on these light combat vehicles in the early years of World War II – originally intended as training tanks. Walter Spielberger describes everything related to the Panzerkampfwagen I and II: their development, their variants, and meticulously details all aspects of their technology, armament, and equipment.