to press into service retreating soldiers and formations that slipped out of the pocket and employed them reinforcing the perimeter of the Yartsevo corridor. Eventually, the 38th Rifle Division was handed over to Rokossovsky when Timoshenko rationalized the command of the shrinking formations in the Smolensk pocket by disbanding Ivan Konev's 19th Army. The Germans were faced with the dilemma of both containing the encircled armies, and dealing with Rokossovsky's burgeoning forces to their east. The 7th Panzer was soon joined by the 12th Panzer at Yartsevo, while the 20th held down their northern flank. With so many Panzer divisions tied down in defensive position containing Soviet activity both inside and outside of the pocket, much of the offensive punch of the Panzer Groups was blunted. Even though "Group Yartsevo" had managed to halt the advance of Hoth's 3rd Panzer Group at Yartsevo, Guderian's 2nd Panzer Group continued to advance south of the Dnepr on Rokossovsky's left flank, becoming a more tangible threat with each passing day. On 18 July, Guderian's 10th Panzer Division entered the town of Yelnya 70 km south of Yartsevo and captured it on the 20th. But on 19 July, German operational objectives for Smolensk changed when Hitler issued Führer Directive 33, ordering the Wehrmacht to temporarily cease its drive on Moscow, so that it could wheel south and finish off the Soviet defenders holding onto Kiev in Ukraine. As a result, Guderian's intended deep penetration was operationally obsolete, and Field Marshal von Bock became intent on mopping up the Soviet defenders at Smolensk so that the Panzer Groups could be released to Army Group South. Impatient with Guderian's slow going, Von Bock urged Guderian to drive north and close the Yartsevo corridor. In anticipation of this development, Rokossovsky had deployed the 107th Tank division to hold the area immediately south of Dnepr, and when the 10th Panzer undertook an unsupported attack northward toward Dorogobuzh from Yelnya, it was repulsed after three days of heavy fighting. The situation temporarily stabilized. On 20 July, Zhukov ordered a general counterattack with the aim of relieving the encircled armies, and beginning on 21 July attacks began along the entire front, and continued for a number of days in an uncoordinated fashion. Meanwhile, the defenders in the pocket increased their efforts to recapture Smolensk. Attacks were made from the south against the flank of Guderian's advanced forces at Yelnya and