One of the most important breakthroughs in military technology associated with World War I, and certainly the one that continues to capture the public imagination, was the introduction of a war machine that came to dominate the face of land battles throughout most of the 20th century: the tank. As a concept, it was not revolutionary; in fact, it harkened back to classical antiquity and to the Middle Ages, such as the covered battering rams and testudos which had made frequent appearances on ancient battlefields. In essence, it was designed to solve the age-old problem of protecting infantry from enemy projectiles while remaining mobile. Ironically, Germany, which would subsequently become famous for panzers and blitzkrieg warfare, was late in taking up the idea. During World War I, the Germans continued to rely on other techniques, and they produced less than two dozen models for battlefield use.
The beginning of World War II found the major powers developing tanks to some extent, but lingering ideas from World War I affected the development of tanks during the Interwar period. As a result, aside from the blitzkrieg doctrine developed by the Nazis, tanks were still used in terms of infantry support, and there were few wars during this period to give strategists the chance to develop better uses for the new armored vehicles before World War II started. Commanders soon found that many of the tanks fielded in the campaigns of 1939-1941 lacked the necessary armor, guns, and designs. Inevitably, tactics evolved throughout the war. The Germans were early leaders in tank tactics, as their successes from Poland through the opening phases of Operation Barbarossa demonstrated. The main German tank tactic was the so-called Schwerpunkt (“center of gravity”), in which a concentration of tanks achieved a local superiority, broke through, and drove deep behind enemy lines.
