The 3rd Panzer Group further north saw slightly better progress, averaging a day. The attack by the 2nd Panzer Group on Tula and Kashira, south of Moscow, achieved only fleeting and precarious success, while Guderian vacillated between despair and optimism, depending on the situation at the front. Facing pressure from the German High Command, Kluge finally committed his weaker south flank to the attack on 1 December. In the aftermath of the battle, Hoepner and Guderian blamed slow commitment of the south flank of the 4th Army to the attack for the German failure to reach Moscow. Stahel wrote that this assessment grossly overestimated the capabilities of Kluge's remaining forces. It also failed to appreciate the reality that Moscow was a metropolis that German forces lacked the numbers to encircle. With the outer defensive belt completed by 25 November, Moscow was a fortified position which the Wehrmacht lacked the strength to take in a frontal assault.