The Nashorn (also called Hornisse) , was an adaptation of the Panzer IV chassis with said gun. The later stages of the war gave birth to more advanced vehicles, like the Jagdpanther , Elefant , and Jagdtiger. The latter, only produced in small numbers, was equipped with the most awesome piece of anti-tank artillery ever carried during the war, a 128 mm (5 in) gun. The tank itself, weighing nearly 72 tons, had a high consumption, suffered a lot of breakdowns, and was tactically difficult to move, as it was forbidden from crossing many bridges.
Despite the manpower and technical limitations imposed upon the German Army by the Treaty of Versailles, several Reichswehr officers established a clandestine General Staff to study World War I and develop future strategies and tactics. One such Reichswehr officer, Hans von Seeckt, became Commander-in-Chief. Seeckt took to heart the lessons learned in the Great War and set about in rewriting the foundation of the German Army. Infantry still remained the heart and soul of any planned offensive, but the tank would become the spearhead of actions that could shatter enemy defenses through speed, force and firepower. Tactics involved the splitting up of enemy formations and counteractions involving pincer movements to surround and ultimately decimate the enemy in whole. By 1926, German Army doctrine was all rewritten to fulfill this vision. Although at first the concept of the tank as a mobile weapon of war met with apathy, German industry was silently encouraged to look into tank design, while quiet cooperation was undertaken with the Soviet Union .  In late 1920s and early 1930s, Germans closely co-operated with Russians in the development of armored vehicles at Kama, near Kazan in USSR. There was also minor military cooperation with Sweden , including the extraction of technical data that proved invaluable to early German tank design. 
The communist German Democratic Republic was established in the historic "Mitteldeutschland" ( Middle Germany ). Former German territories east of the Oder and Neisse rivers, mainly the Prussian provinces of Pomerania , East Prussia , West Prussia , Upper Silesia , Lower Silesia , the eastern Neumark of Brandenburg , and a small piece of Saxony were thus detached from Germany. To compensate Poland for the USSR's annexation of its eastern provinces, the Allies provisionally established Poland's post-war western border at the Oder–Neisse line at the Yalta Conference (1945). As a result, most of Germany's central territories became the Sowjetische Besatzungszone (SBZ, Soviet Occupation Zone). All other lands east of the Oder–Neisse line were put under Polish administration, with the exception of historic northern East Prussia , which went to the USSR.