In 1939, Vatutin planned operations for the Soviet invasion of Poland with Germany, and served as Chief of Staff of the Red Army Southern Group. In 1940, under the command of Georgy Zhukov, this group seized Bessarabia from Romania. As a reward for these non-combat campaigns, Stalin promoted Vatutin to the rank of Lieutenant General and appointed him to the critical post of Chief of the Operational Directorate of the General Staff. Vatutin was, however, not up to his new appointment: while innovative and hard-working, he lacked any combat experience and his knowledge of operational art and strategy was too abstract. Still, his peasant roots, relative youthful age, and party zeal made him one of Stalin's few favorites in the Soviet military. Vatutin, together with the rest of the Red Army high command, failed to prepare the army for the German attack of 22 June 1941.