 From February 1942, Schlemm was attached to the General Command of the 8th Air Corps (Generaloberst Wolfram Freiherr von Richthofen) on the Eastern Front, where he became Commander of Luftwaffen-Gefechtsverbande ("Battle Formation") Schlemm assigned to the XXXX Panzer Corps and the LVI Panzer Corps in General der Infanterie Gotthard Heinrici’s 4th Army.Schlemm became commander of the 1st Air Division in June 1942.In October 1942, he became Commanding General of the II Luftwaffe Field Corps on the Eastern Front.