 Complete the following phrase:  By 7 September the 5th Army was threatened with being split in two by the Second Army coming from the east and the Sixth Armys northern outflanking of Kiev. The Stavka refused permission initially for the 5th Army to withdraw, as they were still hoping for results from a counterattack by the Bryansk Front. By 9 September Stalin had finally given authority for the 5th Army to withdraw but by then it was trapped, and on 20 September Potapov and his command group were taken prisoner. In the disastrous battle, the German forces encircled forces from the 5th, 21st, 26th, 38th and 37th Armies, 