This Freikorps was active in Berlin in January 1919, as part of the Garde-Kavallerie-Schützen-Division under General Lieutenant Heinrich von Hofmann.
On 15 January 1919, Rosa Luxemburg and Karl Liebknecht were captured at Berlin-Wilmersdorf by the Garde-Kavallerie-Schützendivision and brought to their headquarters at Hotel Eden.
Captain Waldemar Pabst, along with Horst von Pflugk-Harttung questioned them and gave the order to execute them.
He is one of two people accused of having shot Luxemburg in the head after Otto Runge had knocked her down with a rifle butt.
[1] After Hitler granted amnesty to those involved in the murders of Liebknecht and Luxemburg, Souchon returned to Germany in 1935 and joined the Luftwaffe, where he rose to the rank of colonel (Oberst) during the war.