(leichte) Gruppe (4th light group) of Jagdgeschwader 134 "Horst Wessel" (JG 134—134th Fighter Wing) at Dortmund.

The unit was initially equipped with the Arado Ar 68 biplane fighter but shortly after converted to the Messerschmitt Bf 109 D-1.

On 5 September, Schalk was ordered to relocate the Gruppe to Neisse, present-day Nysa, Poland, where it was renamed on 1 November and became the III.

[5] World War II began at 04:45 on Friday 1 September 1939 when German forces crossed the Polish border.

Schalk claimed his seventh aerial victory on 24 August, a Royal Air Force Hawker Hurricane fighter from No.