Historical research on the German army of the interwar period has concentrated on the development of the so-called 'Blitzkrieg'. However, Matthias Strohn shows that for most of the time the German army, restricted by the terms of the Versailles Treaty, was too weak to launch an offensive war or even effectively repel an invader. Accordingly, the army focused instead primarily on planning a defensive war against superior enemies, especially France and Poland. Making extensive use of German archival sources, Strohn explores the development of military thought and doctrine for the defence of...