 He served as the liaison officer between Franz Six and the head of Einsatzgruppe B, Arthur Nebe.Following the start of the offensive against Moscow in October 1941, he was promoted to head of "Vorkommando Moskau" the following month.When the Red Army repelled the assault against Moscow, Buchardt was posted back to Łódź in January 1942, where he continued his work as head of the local SD.