On the morning of 15 January, Maslennikov’s 42nd Army attacked the L Armeekorps after another lengthy artillery bombardment and quickly achieved a 4km-deep penetration on the Pulkovo Heights. The breakthrough was assisted by the 36th and 49th Guards Tank Regiments, each equipped with 21 Churchill tanks. Meanwhile, Fediuninskiy smashed the remnants of the two Luftwaffe divisions but mobile group Oskotsky was stopped by a counter-attack from Nordland before it could reach Ropsha. Lindemann was able to organize local counter-attacks on 16–17 January that temporarily slowed the two Soviet armies that were advancing toward each other. Nordland employed its assault guns and mobile artillery to strike at the flanks of the Soviet penetration, but could not seal it off. Maslennikov formed a mobile group with the 1st and 220th Tank Brigades, but these were stopped north of Krasnoye Selo. However after five days of battle, the German defence began to crumble and the Soviet armies surged toward Ropsha. On 19 January, the 2nd Shock Army and 42nd Army fought their way into Ropsha, which isolated a number of German units and forced Lindemann to retreat. Adding to von Küchler’s problems, Meretskov’s Volkhov Front launched an attack against AOK 16 which overran a Luftwaffe division at Novgorod and threatened to unhinge AOK 18’s right flank, as well. Lindemann’s centre was pierced and both flanks were in retreat.
Hitler ordered von Küchler and Lindemann to stand fast, as help was on the way. He promised the transfer of the 12.Panzer-Division from Heeresgruppe Mitte and Panzer-Grenadier-Division Feldherrnhalle from France to reinforce AOK 18, but neither would arrive soon enough to prevent Golikov from completing his breakout. Instead, the only immediate help came from s.Pz. Abt.502, which sent its 3.Kompanie under Leutnant Herbert Meyer with 15 Tigers by rail on 19 January. By the time Meyer’s Tigers arrived at Gatchina on 20 January, the station was already under artillery fire and the lead elements of the 42nd Army were approaching. With the rest of the battalion still en route, Meyer’s Tigers were scooped up by a local commander who ordered him to advance northwest to assist elements of the L Armeekorps, which were under pressure from Soviet armour. With a platoon of four Tigers, Meyer promptly advanced in a movement to contact, completely ignorant of both the friendly and enemy situation. Advancing to the sound of gunfire, Meyer unexpectedly bumped into an enemy tank battalion with 20–30 tanks. The terrain around Leningrad is heavily wooded and the ensuing action must have occurred at short range; three of Meyer’s four Tigers were knocked out and abandoned. Meyer returned with his last Tiger to link up with the rest of his company north of Gatchina, assembling a blocking force on the main road to Leningrad. However, Meyer had no supporting infantry and when the 42nd Army came rolling down the highway the next morning, Kampfgruppe Meyer was quickly encircled. Although Meyer’s Tigers knocked out eight enemy tanks and six anti-tank guns, the situation was hopeless since fuel and ammunition were low. In desperation, Meyer committed suicide and all 11 of his Tigers were destroyed or captured.{3} Without support, the Tiger was little more than a bunker.
With AOK 18’s front broken and the Soviets rolling inexorably toward the Luga River, von Küchler’s nerve cracked and he ordered both armies to retreat to the Panther Line, even though its fortifications were incomplete. Under heavy pressure, AOK 18 conducted a fighting retreat to the Luga River, while AOK 16 fell back about 30km. The remaining Tigers of s.Pz.Abt.502 assisted the AOK 18 in its withdrawal by turning to ambush the Soviet spearheads; on 25 January they claimed 41 Soviet tanks destroyed at Voyskovitsy, 5km southwest of Gatchina. However, German supply lines were disrupted by the retreat and resupply of fuel and ammunition became problematic. On 28 January, the Tigers made a brief stand at Volosovo while the infantry retreated to the Luga River. One lone Tiger was engaged by a battalion with 27 T-34s; despite having only three AP rounds and nine HE rounds, it managed to knock out seven T-34s and then fall back. Yet aside from the few remaining assault guns, Heeresgruppe Nord had almost no other armoured units to serve as a rearguard.
Von Küchler’s retreat order was unauthorized and Hitler immediately sacked von Küchler and decided to replace him with Generaloberst Walter Model, who had already made a name for himself as a steadfast commander. However, by the time that Model arrived in Pskov on 31 January, Heeresgruppe Nord was already in full retreat and Fediuninskiy’s 2nd Shock Army was on the outskirts of Kingisepp. Even worse, Model found that AOK 18 had barely 17,000 combat troops to hold the 115km-wide front on the Luga River, which was insufficient to repulse a determined offensive. Affecting a bold front, Model declared that Heeresgruppe Nord would employ Schild und Schwert (sword and shield) tactics to stop the Soviet steamroller. By this he meant limited tactical withdrawals to enable him to concentrate enough troops for local counter-attacks. Model ordered the establishment of large-scale stützpunkte at Narva and Luga, while combing out infantry replacements from Heeresgruppe Nord’s rear-area troops. He personally went to inspect the defences at Narva and decided to commit the remaining Tigers to reinforce Steiner’s III. SS-Panzerkorps’ defence, since the loss of Narva would fatally compromise the Panther Line.
Yet despite Model’s bravado, the Soviet steamroller kept right on coming, advancing up to 16km per day, overrunning Kingisepp on 1 February and then seizing bridgeheads over the Luga River. At Narva, Fediuninskiy’s 2nd Shock Army managed to cross the Narva River south of the fortress city, but was stopped by a fanatical defence by Gruppe Sponheimer. Other Soviet elements crossed the frozen Lake Peipus, but were quickly destroyed. Generalleutnant Erpo von Bodenhausen’s 12.Panzer-Division arrived by rail from Heeresgruppe Mitte and Model decided to use it in a Schild und Schwert effort to stop the 42nd Army on the Luga River. The 12.Panzer-Division had never been completely refitted from its losses in 1941 and could only field a single Panzer-Abteilung, equipped with a mix of Pz III and Pz IV tanks. In contrast, the Leningrad Front received additional armour for the breakout, included some of the new KV-85s and IS-1s. After a few failed counter-attacks, von Bodenhausen used his armour and Panzergrenadiers to slow the Soviet advance, but the 42nd Army still managed to capture Luga on 13 February. Any hope Model had for standing on the Luga were demolished when Popov’s 2nd Baltic Front joined the Soviet offensive on 16 February and its 1st Shock Army overran the AOK 16 position at Staraya Russa. With Hitler’s grudging acceptance, Model ordered all of Heeresgruppe Nord to retreat to the Panther Line. When the troops arrived at the designated positions, they were forced to dig fighting positions in the frozen, snow covered ground. One innovation that did help was the ‘trench plow,’ a large steel hoe that was towed behind a semi-track vehicle and used to rip open the ground.