Carlos Caballero Jurado: The German Freikorps 1918-23 [2001] paperback

This book charts the seemingly spontaneous growth of the 'Free Corps' movement from the ashes of the Imperial German Army following the 1918 Armistice. Large numbers of former officers and soldiers - often from elite units - assembled in 'private armies' and helped themselves to weapons and equipment Led by highly motivated and often highly decorated combat leaders, these 'Freikorps' fought off both Communists at home and Polish troops in the borderlands with considerable success, founding a nationalist legend. Many went on to serve in the new Reichswehr, and later in the SA and SS.