At the end of the war, he remained on the General staff of the ZBV 55 and XXIV reserve corps.

[citation needed] In August 1919 Pfeffer-Wildenbruch joined the police service and spent time in the Reich Ministry of the Interior.

At the end of 1939, following the invasion of Poland, Pfeffer-Wildenbruch was given command of the 4th SS Polizei Division with the rank of SS-Gruppenführer.

After the Battle of France he returned to the staff of the Reichsführer-SS, serving as chief of the colonial police from 1941 to 1943.

[2][3] In December 1944 Pfeffer-Wildenbruch was appointed commander of the IX SS Mountain Corps, stationed in Budapest, Hungary.