The Württembergische Freiwilligen-Abteilung Haas was formed on 25 February 1919 at Truppenübungsplatz Münsingen. It saw action in Augsburg, against the Münchener Räterepublik in Munich in April-May and in the Ruhr in April 1920.
It was used to form Reichswehr-Brigade 13 in June.

Commanders

Generalleutnant Otto Haas

Formed in the area of

Generalkommando XIII. Armeekorps Stuttgart (Freistaat Württemberg)

Manpower strength

2.376

Order of battle

1. Württembergische Freiwilligen Regiment
2. Württembergische Freiwilligen Regiment
3. Württembergische Freiwilligen Regiment

Notable members

General der Infanterie Karl Allmendinger
Generalleutnant Walter Botsch
SS-Brigadeführer Christoph Diehm
SS-Oberführer Oskar Dirlewanger
Generalmajor Gustav Feller
Generalleutnant Otto Haas
Generalmajor Hermann Hiller (Luftwaffe)
Generalleutnant Hermann Plocher (Luftwaffe)
SS-Gruppenführer Rolf Reiner
(the ranks are the highest ranks reached in the Third Reich era)

Sources used

Nigel Jones - The birth of the Nazis: How the Freikorps blazed a trail for Hitler
French L. MacLean - The Cruel Hunters: SS-Sonder-Kommando Dirlewanger Hitler's Most Notorious Anti-Partisan Unit
Georg Tessin - Deutsche Verbände und Truppen 1918-1939
Robert G. L. Waite - Vanguard of Nazism: The Free Corps Movement in Postwar Germany 1918-1923
Charles Woolley - German Uniforms, Insignia & Equipment 1918-1923

Reference material on this unit

Björn Preuß - Der Kampf gegen Spartakus: Die Württembergische Freiwilligen-Abteilung Haas