In the past, the Soviets had been unable to get three Fronts to work simultaneously against a single German army, but now the operational-level efficiency of the Red Army had increased to the point where coordinated action was achieved and the Germans were being pounded from all directions. Soviet artillery was particularly dominant, gradually wearing down every German front-line position. Faced with a deteriorating situation, Model opted to conduct spoiling attacks with his panzers to knock the Soviets off balance. On 17 July, 2. and 8.Panzer-Divisionen mounted a sharp counter-attack against Panov’s 1 GTC that knocked out 25 tanks. However, Rendulic’s XXXV Armeekorps was gradually being worn down by continuous infantry and artillery attacks from Popov’s 3rd and 63rd Armies, forcing it back toward Orel. Model authorized Rendulic to conduct tactical withdrawals as needed, without the permission of either Hitler or the OKH. By the time that Zhukov finally allowed Rybalko’s rebuilt 3rd Guards Tank Army (3 GTA) to be committed on Popov’s Front on 19 July, Rendulic had already pulled back to shorten his lines and the Soviet armoured fist hit empty positions.
By 20 July, Harpe had stabilized the situation in the north and reduced Bagramyan’s advance to a crawl. The OKH transferred several infantry divisions to rebuild the gap where the LIII Armeekorps had been and Model successfully lobbied for the Großdeutschland to be transferred to him from von Manstein’s front. Bagramyan’s 11 GA had also outrun its supplies. However, Popov’s Bryansk Front was still in good supply since it had two functioning railheads nearby and Popov decided to use Rybalko’s 3 GTA to break open Rendulic’s increasingly thin frontline. Yet instead of using the armour in mass, Popov made the mistake of ordering Rybalko to split his armour and advancing on two divergent axes: the 15th Tank Corps and 2nd Mechanized Corps would proceed northwest to cut the rail line at Otrada while the 12th Tank Corps would advance southwest to overrun one of Rendulic’s infantry divisions. The result of this dispersal was that the Soviet armour gained ground and knocked the German front line back toward Orel, but 3 GTA failed to encircle or destroy any German units. Instead, the Germans hunkered down with 12.Panzer-Division blocking Rybalko’s 3 GTA from entering Orel. In the north, Harpe conducted a strong defence around Bolkhov and the Western Front opted to fight an extended positional battle for this unimportant town rather than using its mobility to outflank Harpe’s Panzers. For nearly a week, Model’s hard-pressed troops fought all three Soviet fronts to a near standstill. However, the cost was high in terms of resources and the Ferdinands, which had proved themselves as excellent defensive weapons, were almost all non-operational now due to mechanical defects and lack of spare parts.{138}
It was not until 26 July that the Soviets were able to make any progress. Rybalko’s 3 GTA shifted south and reinforced an attack by 63rd Army against the boundary between the XXXV Armeekorps and XXXXVI Panzerkorps. Although Rybalko’s armour was unable to break through, when Rokossovsky committed his forces to this axis as well, the Germans gradually began pulling back. German anti-tank fire devastated Rybalko’s armour, knocking out 669 of his tanks in a week of combat. In the north, Zhukov finally released Badanov’s 4th Guards Tank Army (4 GTA) and Kriukov’s 2nd Guards Cavalry Corps (2 GCC) to reinforce the Western Front’s offensive, but achieved only modest results. The Großdeutschland arrived just in the nick of time to block Kriukov’s cavalry from severing the Orel-Bryansk rail line and 4 GTA only managed to force Harpe to abandon Bolkhov.{139} Model did the best he could to delay the inevitable and inflict maximum damage on the enemy, while conserving his own forces, but on 31 July he requested and received permission from Hitler to abandon Orel and retreat to the Hagen Stellung. Unlike von Manstein, Model had developed a contingency plan and had carefully prepared a rearward defensive line along the Desna River.
The 12.Panzer-Division conducted the rearguard mission in Orel, delaying the Soviet entry into the city and ensuring that all bridges over the Oka River were destroyed. On the night of 4 August, 12.Panzer-Division evacuated the city and the Soviet 63rd Army marched in the next morning. Badanov’s 4 GTA and Rodin’s 2 TA mounted a pursuit against Model’s forces as they withdrew to the Hagen Stellung, but Model used his Panzer-Divisionen as mobile rearguards, successfully fending off Soviet probing attacks. During these missions, German tank platoons were deployed in defilade positions with their main guns over the rear deck; when the lead Soviet tanks appeared they would be knocked out and the German tanks would fall back to the next position to repeat again. These delay tactics were costly for the Soviets and induced caution in the advance tank brigades. By 18 August, Model’s AOK 9 and the remnants of PzAOK 2 were entrenched in the Hagen Stellung and the Stavka declared Operation Kutusov to be completed with the liquidation of the Orel Salient. The 38-day Operation Kutusov inflicted four times as many casualties upon Model’s forces as Operation Zitadelle had, a total of 88,000, including 27,000 dead or missing. All eight Panzer-Divisionen under Model’s command had suffered considerable losses, including 229 tanks and tank destroyers. Between Zitadelle and Kutusov, Heeresgruppe Mitte had lost one-third of its armour.
While Kutusov was an operational triumph for the Red Army, at the tactical level it was a frustrating and costly effort. The three Soviet fronts had suffered a total of 429,890 casualties during the operation and lost 2,586 tanks – enormous losses even by Red Army standards. Furthermore, the performance of all three Soviet tank armies was sub-par since they were used to fighting positional rather than manoeuvre battles. Instead of penetrating and encircling German units, Soviet armour pushed German units back to their next delay position. Although hard-pressed, the German tankers had great sport ambushing the Soviet vanguard battalions then falling back to the next position. The Soviets triumphed in Kutusov primarily because of their artillery and air support, plus plentiful infantry, not because of their tankers. Thus one of the lessons for the Red Army about Kutusov was that it needed to employ its tank armies more efficiently to achieve decisive, rather than local, results. Numbers had not won the battle for the Soviets, dogged persistence had. For the Germans, Kutusov was an ominous preview of coming attractions.
The Mius River Battles, 17 July–2 August 1943
Von Manstein had only been able to assemble a large enough force to conduct Zitadelle by prioritizing reinforcements and replacements to Hoth and Kempf, at the expense of his other two armies – Generaloberst Eberhard von Mackensen’s 1.Panzerarmee (PzAOK 1) and General der Infanterie Karl Adolf Hollidt’s 6.Armee (AOK 6). Although von Manstein fully expected that the Soviet Southwest and Southern Fronts could mount a major assault across either the Donets or the Mius rivers at any time, he took a calculated risk that PzAOK 1 and AOK 6 could fend off these attacks while he used his main armoured forces to crush the Voronezh Front. For their part, the Stavka directed these two fronts to build up their forces and wait for the right moment. Unlike the resource-starved Wehrmacht, the Red Army was able to deploy three mechanized corps, one tank corps and 20 other tank units with a total of about 1,300 tanks to support these two secondary fronts.