After the war, he joined the "Grenzschutz Ost" Freikorps as a General Staff officer, serving in Silesia and Pomerania. In 1919 Reichenau joined in the newly established "Reichswehr" of the Weimar Republic. The officer corps of the new armed forces' was limited to 4,000, and there was to be no General Staff. Reichenau took a post in the "Truppenamt", which was the "underground" equivalent of the General Staff formed by Hans von Seeckt. He was promoted to Major in 1924, to Lieutenant Colonel on 1 April 1929 and Colonel on 1 February 1932. In 1930 Reichenau was appointed Chief of Staff to the Inspector of Signals at the Ministry of the Reichswehr. He was later introduced to Hitler in April 1932 by his uncle, a diplomat. Extremely ambitious, he saw the Nazi Party as a revolutionary vessel in which he could propel his career and so broke with the pro-Monarchist politics of the Prussian military caste and became a devoted Nazi.