 Complete the following phrase:  When Operation Barbarossa began in June 1941 Sukhomlin was named deputy chief of staff for the Northwestern Front centered around Leningrad. In September he was chosen as acting chief of staff for the 54th Army, part of the Leningrad Front. In January 1942 he briefly assumed command of the 8th Army on the Volkhov Front before taking command of the 54th Army, recovering from the Soviet loss in the 