After World War I and prior to World War II (interwar period) Germany’s military was hindered by the Treaty of Versailles.
-Germany used the innovation of Military Doctrine and Mechanization of Armor during the interwar period to achieve initial success and overmatch during the beginning of World War II.
-The development of the Panzer division was part of the innovation with using combined arms and tanks as an offensive weapon. General Seeckt was the driving force for this innovation.
Conclusion: The Germans focused on military doctrine and mechanized armor innovation during the interwar period to achieve success. By 1939 Germany had the best trained and effective army in the world despite its size. Its initial success leading up to operation Barbarossa and the invasion of Russia were a testament to innovation.