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von Mackensen and was a central figure in planning the victories Mackensen achieved for Germany in the east during the First World War. During the years of the Weimar Republic he was chief of staff for the Reichswehr from 1919 to 1920 and commander in chief of the German Army from 1920 until he resigned in October 1926.[N 1] During this period he engaged in the reorganization of the army and laid the foundation for the doctrine, tactics, organization, and training of the German army. By the time Seeckt left the German Army in 1926 the Reichswehr had a clear, standardized operational doctrine, as well as a precise theory on the future methods of combat which greatly influenced the military campaigns fought by the Wehrmacht during the first half of the Second World War. While Seeckt undertook multiple programs to get around the military limitations imposed by the Treaty of Versailles which formally ended the state of war between Germany and the Allied Powers after World War I, he has been criticized for failing to expand the reserves of officers and trained men available to the army, the main obstacle to rearmament during the Republic.