It was successful in the 1921 Battle of Annaberg and became the core of the Sturmabteilung (SA) in Bavaria while several members later turned against the Nazis.
In the Silesian Uprisings of 1921 the Freikorps was ready and participated in the conquest of the eponymous hill in Annaberg in Upper Silesia.
The Bavarians of the Freikorps Oberland were characterized by atrocities towards prisoners of war and the Polish civilians.
[3] Some members of Oberland were possibly involved with the murder of USPD politician Karl Gareis (1889–1921).
[5] Under the guidance of Weber, Bund Oberland approached continuously to the radical people[clarification needed] under Adolf Hitler and Ernst Röhm.
Together with the "Wehrverband Reichsflagge" and the SA the Bund formed the "Arbeitsgemeinschaft vaterländischer Kampfverbände" in January 1923 .
Because of his participation in the coup attempt the Bund Oberland e. V. was banned in Bavaria and, by the end of 1923, across Germany.
After the War, in 1951, the old fighters gathered around Ernst Horadam and founded the still-existing traditional community Kameradschaft Freikorps und Bund Oberland.
According to a statement of the president of Landsmannschaft Schlesien the event was regularly monitored by the State Office for the Protection of the Constitution.