The Sudetendeutsches Freikorps (also Freikorps Sudetenland, Freikorps Henlein and Sudetendeutsche Legion) was a paramilitary organization of ethnic Germans active in Czechoslovakia during 1938. It was officially under the control of Konrad Henlein, the leader of the pro-Nazi Sudetendeutschen Partei (SdP), but it was formed in Germany by the Abwehr in Dresden in September. It attacked Czech border guards in a few cases and elements of it later took part in the annexation of the Sudetenland. In October is was disbanded with many of the members joining various Nazi organizations and some later joined the Freikorps Ebbinghaus and the Brandenburg special forces unit (initially known as the Deutsche Kompanie z.b.V.).

Commander

Konrad Henlein

Deputy Commander

Karl-Hermann Frank

Freikorps men with the unit flag

(From "Von Der SDP Zur NSDAP: Ein Dokumentarischer Bildbericht" (1939) by Franz Höller)

Freikorps men on parade

(From "Von Der SDP Zur NSDAP: Ein Dokumentarischer Bildbericht" (1939) by Franz Höller)

Konrad Henlein

(From "Von Der SDP Zur NSDAP: Ein Dokumentarischer Bildbericht" (1939) by Franz Höller)

Karl Hermann Frank

(From "Von Der SDP Zur NSDAP: Ein Dokumentarischer Bildbericht" (1939) by Franz Höller)

Adolf Hitler inspecting a parade of Freikorps men

(From "Von Der SDP Zur NSDAP: Ein Dokumentarischer Bildbericht" (1939) by Franz Höller)

Adolf Hitler visiting wounded Freikorps-men

(From "Von Der SDP Zur NSDAP: Ein Dokumentarischer Bildbericht" (1939) by Franz Höller) 

Freikorps members being welcomed in the Sudetenland on 3 October 1938

(Courtesy of Bundesarchiv/Wikimedia, licensed under Creative Commons Attribution ShareAlike 3 0 Germany)

Freikorps members in Niemes on 10 October 1938

(Courtesy of Bundesarchiv/Wikimedia, licensed under Creative Commons Attribution ShareAlike 3 0 Germany)

Panzer III entering Komotau (Chomutov) in the Sudetenland

(Courtesy of Bundesarchiv/Wikimedia, licensed under Creative Commons Attribution ShareAlike 3 0 Germany)

Memorial near Mařenice commemorates to the Czechoslovak State Defense Guard killed in clashes with the Freikorps Sudetenland

(Courtesy of Rolf)

Sources used

Christopher Ailsby - Hitler's Renegades: Foreign nationals in the service of the Third Reich
Franz Höller - Von Der SDP Zur NSDAP: Ein Dokumentarischer Bildbericht (1939)
Eric Lefevre - Brandenburg Division: Commandos of the Reich
David Littlejohn - Foreign legions of the Third Reich, vol 3
Marcel Roubicek - The Special corps of Austria and Czechoslovakia 1918-1945

Reference material on this unit

Franz Höller - Von Der SDP Zur NSDAP: Ein Dokumentarischer Bildbericht (1939)