Vanguard of Nazism: The Free Corps Movement in Postwar Germany 1918-1923 | 
pickWhile this was written in 1952 and there is likely great modern scholarship on the matter, this is still a highly accessible and well researched piece on the origins, mindset, motivations and actions of those German soldiers who could not “psychologically demobilize” from the trenches of WWI once they left the front. The various freikorps were arguably the predecessors of the SA and SS, instruments of the nazi terror and war machines.
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