A 106-page Gestetner US Army War College 1925 translation of von Seeckt's 1921 historically important regulations that are fundamental to understanding the army that Germany went to war with in 1939. His vision of a Neuzeitliches Heer (modern army) was of special importance to him and became the core of his innovative thinking, even if the restrictions of the Versailles Treaty made sure that it remained only a vision. This army would be characterised by a small number of soldiers, who would be well trained and equipped. This would enable the army to conduct a highly mobile war, which von Seeckt saw as the key to success in future conflicts. The tactics and operational concepts of the Wehrmacht were the work of von Seeckt in the 1920s.