He served as a war volunteer in World War I and in the Brigade Ehrhardt ( 1919 -- 1920 ) .
Kaufmann was born in Krefeld on 10 October 1900 .
Kaufmann served as a war volunteer in World War I and in the Brigade Ehrhardt ( 1919 -- 1920 ) .
Kaufmann was born in Krefeld on 10 October 1900 .