From 20 December 1940 to 4 October 1941, Stülpnagel was a General of Infantry (April 1939) and commanded the 17th Army. On 22 June 1941, after the launch of Operation Barbarossa, he successfully led this army across southern Russia on the Eastern Front. Under Stülpnagel's command, the 17th Army achieved victory during the Battle of Uman and the Battle of Kiev.