On September 12, the 73rd Infantry-Division’s line of defence was broken despite tank support from Panzer-Regiment 27. The German infantry troops fled in panic towards the town. On the road between Anin and Wawer (along the Otwock line) the Polish 1st Infantry Division destroyed the German Artillery-Regiment 173. The only troops left at the German defensive positions were panzer-grenadiers from the 19th Panzer-Division, but due to their meagre number (in the combat companies of both regiments’ four battalions at that time, there were barely 900 soldiers — but Polish records report that only Panzergrenadier-Regiment 74 participated in the fighting), the Poles were able to hold a broad front. An irritated von Vormann wrote that “the opposition’s attack has completely broken through the 73rd Infantry Division’s front […] during the course of two days fighting the division has not shown any fighting spirit whatsoever, and therefore cannot be said to possess any combat value worthy of mention.” The Hungarian soldiers also withdrew from Rembertów in the direction of Zielonka. The 77th Rifle Corps, which followed in their tracks, received support from tanks of the 8th Guards Tank Corps. General Gusiev, however, had no intention of letting his tank corps get bogged down in street fighting — he only intended them to be used in attacking the city’s suburbs from the flanks. Despite this, individual tank battalions remained in order to support the 125th Rifle Corps.
Towards evening, the 175th Rifle Division moved over towards Gocław, while the 1st Infantry Division and the 76th Rifle Division made a northerly detour around the effective defences at Grochów, taking Kawęczyn and closed in on the built up communities of Utrata, Elsnerów and Ząbki. On or about the same time this was taking place, 1640 hours to be precise, Captain Kapuściński from the 1st Infantry Regiment entered Praga’s centre. General Källner carried out several counter-attacks, with the support of tanks, near the city sector Saska Kępa in Targówek: On September 12, in the Polish sector alone, eight such attacks were carried out. But these were thrown back by the 175th Rifle Division’s artillery and the Polish 1st Infantry Division (for defensive purposes, using the 1st Light Artillery Regiment’s direct-target guns). Now the Germans, together with the Hungarian 1st Cavalry Division, tried to organise a new defensive line along the Zielonka — Ząbki — Elsnerów railway. The 19th Panzer-Division carried out a defensive manoeuvre. The commander of the 1st Infantry Division reported that the enemy operated in formations of 8–14 tanks supported by one or two infantry companies. What was particularly amazing was that they had identified the “Elephants” company, but naturally the whole business turned out to be a misunderstanding. On the German side, the only success experienced on September 12 was the 3rd SS-Panzer-Division “Totenkopf’s” effective counterattack, which had taken place in the forest near Słupno. Following on a violent grenadier assault supported by tank artillery, the 144th Rifle Corps was driven out of the Nięporet-Forest.
On September 13, at 1000 hours, the Soviet and Polish forces resumed the assault. It began with street battles in Praga. General Wojciech Bewziuk now despatched tanks from the 1st Tank Brigade “The Wester-Plains heroes” to the 1st Infantry Division’s assistance. (the order issued by the commander of the 1st Tank Brigade at 1100 hours indicates that the 2nd Tank Battalion and the 1st and 2nd Batteries equipped with SU-85 assault-guns from the 13th Artillery Regiment were sent into battle). After an entire day of hard fighting against a Kampfgruppe drawn from the 19th Panzer-Division. the 175th Rifle Division succeeded in taking control over the southern part of the city’s sectors of Saska Kępa, Gocławek in Grochów, which prompted the Germans to blow up the Poniatowski Bridge and also to destroy, somewhat prematurely, a railway-bridge. The Polish troops fought in Targówek and reached the area around the East and the Wilno rail stations, and continued the offensive in the direction of the Kierbedź Bridge. Meanwhile, as this was unfolding, the 76th Rifle Division became engaged in intensive fighting with the main force of the 19th Panzer-Division, between Targówek and Zacisze. The German division launched several counterattacks in the Zacisze area attempting to outflank the 125th Rifle Corps storming the buildings of Praga. But in the end, the Germans were forced to give way to Soviet pressure, particularly as during the course of that afternoon the 77th Rifle Corps’ infantry, and tanks from the 8th Guards Tank Corps, had positioned themselves in the neighbouring Zabki-Zeilonka zone.
Defending the city with only one panzer division was, for all practical purposes, an impossibility. The Germans were short infantry sufficient to man all their positions; even though the German Field Police placed the newly trained 73rd Infantry Division’s small units into battle, while the command of the 9thArmy sent what remained of the Panzer-Jäger-Bataillon 475, plus a number of security and training battalions. Clearly, these measures were of doubtful significance when compared with the massive combat forces storming Praga. General von Vormann informed the staff of Heeresgruppe “Mitte” about the situation at Praga, and on September 13, he received permission to withdraw from the centre toward the northern suburbs. The 19th Panzer-Division, remnants of the 73rd Infantry-Division and the Hungarian 1st Cavalry Division were now to form a new defence line from Brudno to Marki. Immediately after this had been organized, the IV SS-Panzer-Corps was instructed to send the Hungarian division to the reserve forces. This order was dictated by the plan to send all in-country Hungarian troops to Hungary. Instead of retaining the weak (Hungarian) cavalry, the plan was to send a Kampfgruppe from the 25th Panzer-Division under the command of Colonel Oskar Audörsch; a formation which had been previously earmarked for combat operations outside Pułtusk. In an effort to neutralise possible Soviet or Polish landing-forces from crossing to the Wisła’s western shore; the German command decided to deploy an elite unit, Fallschirm-Pz. Gren.Rgt.2 “Hermann Göring” (from Magnuszew) to Warsaw.
On September 14, large sections of Praga had been liberated. During the night, the retreating Germans had blown up the Kierbedź-Bridge and the railway bridge at Cytadela. At 0500 hours, the 1st Infantry Division’s 2nd Infantry Regiment had control of the Wilno rail station. Intense fighting developed around the bridgeheads, especially in the zoological garden and in the field in front of the railway bridge where the fighting continued to rage throughout most of the following day. In the evening, the IV SS-Panzer-Corps units, which up until then had been defending the city, took up positions along the Bródno — Stare Bródno — Marki line. In the vicinity of Marki, the 3rd SS-Panzer-Division “Totenkopf” had already taken command of the front. The situation for Gille’s corps became critical since all the corps within the 47th and 70thArmies had joined in the combat operations. In an effort to save the situation outside Praga, combat battalions from the Waffen-SS panzer divisions were dispatched there with the thought they would reinforce the Hungarian units or the 19th Panzer-Division. On the morning of September 15, with the support of heavy artillery and massive air assaults by planes from the 2nd and 11th Air- assault Divisions; the Soviet 70th Army, and the 96th Rifle Corps beat the 5th SS-Panzer-Division “Wiking” back from Białobrzegi to Nieporęt, which at the same time allowed these attacking forces to reach as far as the village of Aleksandrów. With the position at Słupno having been outflanked, SS-Gruppenführer Gille was forced to also order the 3rd SS-Panzer-Division “Totenkopf” to withdraw. The troops from this division, who had been in continuous combat with the 114th Rifle Corps, relinquished Nieporęt-Forest and retired across the Królewski Canal in the vicinity of Stanisławów (which in 1963, after having been deepened and broadened became part of the Żerański Canal). Soldiers from the 3rd SS-Panzer-Division “Totenkopf” were also fighting against the 129th Rifle Corps from the 47th Army. And on September 15, three rifle divisions from this corps managed to gain control of the Czarna Struga and Struga Rivers, and at Marki made contact with the 77th Rifle Corps’ 185th Rifle Division. The Germans withdrew towards the north with the intent of shortening their frontline. By evening, the 125th Rifle Corps and the 77th Rifle Corps along with the 8th Guards Tank Corps had occupied the districts of Bródno, Stare Bródno, Annopol, Żerań, Białołęka and Marki. It wasn’t until darkness began to fall that their assault was finally neutralized by counterattacks launched by Kampfgruppe from the 19th Panzer-Division and the 3rd SS-Panzer-Division “Totenkopf.”