Upon his promotion to Generalmajor on August 6, 1943, Koll became Chief of Repair Matters in the Office of the Oberkommando der Wehrmacht and served in this capacity until November that year, when he was sent to the Infantry School in Döberitz for Division-Leaders course. Koll completed that instruction one month later and assumed temporary command of 1. Panzer-Division stationed in the southern sector of the Eastern Front. Unfortunately he did not perform well in the division’s attempt to relieve the Cherkassy pocket in February 1944 and was relieved of command by General Hermann Breith, commander of III Army Corps.