Despite the success in sealing the breach, it was obvious that AOK 6 was on the verge of collapse. Fechner’s battalion was reduced to just five operational Panthers and the 9., 13., 17. and 23.Panzer-Divisionen were little more than battlegroups. Hollidt lacked the strength to eliminate the two isolated Soviet mechanized units near Pavlograd and it was obvious that the rest of Tolbukhin’s forces would soon break through to them. Nor was Hoth’s sector in any better shape, since the Voronezh Front had driven a wedge between 2.Armee and PzAOK 4 near Romny and Hoth’s left flank was unravelling. Von Manstein met again with Hitler and stated that either Heeresgruppe Süd had to retreat to the Dnepr to avoid destruction, or the OKH had to immediately send 12 fresh divisions to reinforce it. Hitler was always reluctant to cede territory, but he had very few reinforcements to offer, so on 8 September he agreed to allow AOK 17 to finally abandon the Kuban in order for its troops to be sent to reinforce AOK 6. However, it took another week of heavy fighting and the realization that Hollidt’s AOK 6 was in immediate danger of being encircled and destroyed to finally convince Hitler to change his mind. During the 10 weeks between the start of Zitadelle and the loss of Stalino, Heeresgruppe Süd had suffered over 185,000 casualties, including 51,000 dead or missing – the Third Reich simply could not afford to replace these losses in a timely manner. With Hitler’s grudging approval, on 15 September von Manstein finally ordered his four armies to begin withdrawing to the Panther Stellung behind the Lower Dnepr River and the Wotan Stellung at Melitopol. The later city needed to be held, even though it was on the east side of the Dnepr, because it protected the land route to the Crimea, which Hitler wanted to hold. In his mind, the Panther-Wotan Stellungen were impregnable positions, even though he had only authorized construction four weeks before and no work had even begun on any fortifications.
Retreats are painful and even worse if the enemy is actively pursuing. Many of the German tanks that were damaged or awaiting repair had to be blown up, including 20 of Fechner’s brand-new Panthers.{175} A total of 80 Panthers were lost in September, mostly due to mechanical defects that forced their crews to abandon them.{176} Discipline in some German units began to slip during the retreat as troops availed themselves of liquor from supply depots that were going to be abandoned. Other troops simply went missing. Von Manstein’s forces had to retreat 150km or more to get behind the Dnepr and then cross at one of six bridges. The German infantry divisions relied on horses and carts to move their artillery and supplies, which meant that they could not outrun fast-moving armour units equipped with T-34s. This discrepancy in tactical mobility meant that most of the German Panzer-Divisionen would have to conduct rear guard actions in order to buy time for the slower-moving formations to retreat to the Dnepr. However, von Manstein also recognized that he needed to get some forces to the main crossing sites over the Dnepr – at Kiev, Kanev, Cherkassy, Kremenchug, Dnepropetrovsk and Zaporozhe – as soon as possible in order to prevent the Soviets from seizing any of these with a coup de main. Thus, von Manstein was on the horns of a dilemma about the best use of his armour during the retreat – to protect his infantry or to protect the crossing sites. Von Manstein decided to deploy all of the III. and XXXXVIII Panzerkorps to conduct a major delay operation at Poltava with four Panzer-Divisionen (3., 6., 7., 11.) and four Panzergrenadier-Divisionen (Wiking, Das Reich, Totenkopf and Großdeutschland) in order to give his slower-moving forces more time to withdraw. However, the 19.Panzer-Division was ordered to retreat straight to Kiev and then spread out to defend the far side of the river. Hoth was ordered to retreat toward Kiev, Kanev and Cherkassy, then spread out quickly to defend the various crossing sites. Wöhler’s AOK 8 was to head for Kremenchug, but assist with the delay at Poltava. Von Mackensen’s PzAOK 1 would head for Dnepropetrovsk and Zaporozhe, while Hollidt’s AOK 6 would retreat to Melitopol. As the retreat began, it began to rain heavily, further slowing the Germans down.
The Stavka had been expecting von Manstein to retreat to the Dnepr at any time and once indications of withdrawal were detected by Soviet aerial reconnaissance, Stalin issued orders directly to the fronts for the advance to the Dnepr. Five fronts surged toward the Dnepr with over two million troops and 2,000 tanks. Vatutin would head for Kiev and the Dnepr Knee and was provided Rybalko’s partly-refitted 3 GTA (7 GMC, 9 MC, 6 GTC, 7 GTC, 91 TB) to act as a mobile group (podvizhnyi grupp) in the drive toward the Dnepr from the Romny area. Although Rybalko only had about 50 per cent of his authorized tanks and one of his motorized brigades had no trucks, it was still a powerful force with over 300 tanks. Both Katukov’s 1 TA and Rotmistrov’s 5 GTA had been temporarily pulled back to refit after weeks of heavy combat, leaving Rybalko’s half-strength tank army as the only large mechanized formation available for the time being. Konev was ordered to head for Kremenchug, Malinovsky for Dnepropetrovsk and Tolbukhin for Melitopol. While all these fronts received additional reinforcements from the RVGK, ammunition and fuel stockpiles at the front were very low after weeks of heavy combat and this impaired the ability of the Red Army to conduct high-tempo mobile operations for more than a few days.{177} Nor did the Red Army logisticians have the means of moving large amounts of supplies forward, due to shortages of trucks and the damage inflicted upon the rail lines by the retreating Germans. In terms of engineer support, the fronts moving toward the Dnepr had five pontoon bridging brigades and three heavy pontoon regiments, but the problem was that the ‘scorched earth’ tactics used by the Germans made it difficult to push these cumbersome support units forward to where they needed to be and the insufficient amount of fuel available was mostly going to combat units.{178}
Recognizing the difficulty of crossing the Dnepr, the Stavka began preparing several airborne brigades to support an assault crossing of the Dnepr. Vatutin was given operational control over a provisional airborne corps (1st, 3rd and 5th Guards Airborne Brigades) with 10,000 paratroopers and the authority to employ them. On the night of 19–20 September, Rybalko’s 3 GTA began advancing toward the Dnepr, with Podpolkovnik Trofim F. Malik’s 56th Guards Tank Brigade as the advance guard. The Stavka believed that the Germans would have all the major crossing sites well defended (a false assumption, as it turned out) so Rybalko was ordered to head for the so-called ‘Dnepr Knee,’ a great bend in the river south of Kiev and near the Kanev crossing site. Soviet partisans had reported that there were no German forces in this area and the Stavka hoped that Rybalko could ‘bounce’ this undefended section of the Dnepr before the Germans arrived.