エアハルト海兵旅団
Souchon, a nephew of Admiral Wilhelm Souchon, was born in Bromberg, Province of Posen (Bydgoscz, Poland). He served in the First World War as lieutenant in an artillery regiment. In 1915, he went to the Imperial Navy as an ensign. After the end of the war, he was discharged and became a member of Marinebrigade Ehrhardt. This Freikorps was active in Berlin in January 1919, as part of the "Garde-Kavallerie-Schützen-Division" under General Lieutenant Heinrich von Hofmann.