Then with the September 1939 invasion of Poland, the SA lost most of its remaining members to military service in the Wehrmacht (armed forces).

During the war, he was first company commander in the rank of lieutenant of the reserve, then battalion adjutant, and finally court officer.

Together with Viktor Lutze, he organized the formation of the SA in the Ruhr area and as early as 1928 he was a local Party leader.

In the wake of the Night of the Long Knives, Schepmann took over the leadership of the SA Group in Saxony from November 1934 onwards.

[citation needed] After Viktor Lutze died from injuries sustained in a car crash on 2 May 1943, Max Jüttner took over the interim position of SA Chief of Staff.

He managed to have units in the army (Panzerkorps Feldherrnhalle), Kriegsmarine, and Luftwaffe (Jagdgeschwader 6 Horst Wessel) given SA honour titles, and even a Waffen-SS division (18.

After the end of the war in Europe, Schepmann lived under an assumed name ("Schumacher") in Gifhorn and worked as a material manager in the district hospital.

In April 1949 he was recognized and arrested by the British Secret Intelligence Service, and tried before a Dortmund jury at the end of June 1950.

He is the father of Richard Schepmann, head of the Neo-Nazi publishing house Teut-Verlag, who was jailed in 1983 for inciting racial hatred.