:::Gordon craig's ''Politics of the Prussian Army'' would be an excellent source.
:::The Second Reich lasted only 44 years (1871-1914), not even one lifetime. So what books in 1919 called "German nationalism" is very different from our understanding today. German "nationalist" identity was forged in that period, modeled on France nationalism of the Napoleanic era (something France always feared). At the time of Napolean, there was no German national identity; at the time of unification, Austria and Switzerland were excluded from German national identity.
:::The Friekorp movement existed among several German states for centuries. Even during World War I, however, there was no integration of troops. Hitler, for example, was an Austrian, serving in a Bavarian regiment, under Prussian officer's command. By 1919, there was somewhat of a German national identity among veterans, but there still were separate Bavarian Friekorps, Prussian Friekorps, Hessian Friekorps, etc. There was no unified, consolidated movement. So even calling the them "nationalist' can be questionable. It was Hitler, the Austrian, preaching German nationalism, that called out many from the various units in Nazi paramilitary organizations. [[User:RobSmith|RobS]]<sup>[[User talk:RobSmith|''Deep Six the Deep State!'']]</sup> 15:22, 2 July 2019 (EDT) :::We see the same tribal phenomenon in Iraq and Afghanistan, and U.S efforts to build an "Iraqi National Army" and "Afghan National Army." The situation there, and in the Second Reich, was like the Union Army of the Civil War were each state sent it's own regiments. [[User:RobSmith|RobS]]<sup>[[User talk:RobSmith|''Deep Six the Deep State!'']]</sup> 15:30, 2 July 2019 (EDT)