The 1919 Weimar Constitution provided for a unified, national ministry of defence to coordinate the new Reichswehr, and that ministry was set up in October 1919, from the existing Prussian War Ministry and Reichsmarineamt. It was based in the Bendlerblock building. The Wehrgesetz (Defence Law) of 21 May 1935[1] renamed it the Reich Ministry of War (German: Reichskriegsministerium), which was then abolished in 1938 and replaced with the Oberkommando der Wehrmacht.