On the previous day, the Germans and Hungarians fell back to the island's north end and occupied a segment of the Attila Line fortifications. On the morning of 25 November, the front line followed a line 500 meters north of Szigetszentmiklós, one kilometer south of Hill 102 and one kilometer north of Tököl. The Soviet 1075th Rifle Regiment launched an attack supported by SU-76 self-propelled guns, from the west and southwest toward the flank of the SS 17th Cavalry Regiment defending Szigetszentmiklós.

The attack began with self-propelled guns shelling the western bank of the Danube. The attackers made rapid progress toward the right flank of the Germans, but the Feldherrnhalle Panzer Grenadier division in command of Axis forces on the island prepared counterattacks to regain the lost territory.

The Soviet 316th Rifle Division captured Hill 102 and Hermina Major, a hamlet close to the Tököl airfield. In the late afternoon, the Hungarians supported by assault guns and half-tracks from the Feldherrnhalle Panzer Grenadier Division drove the Soviets back to their jump-off positions.

Two Feldherrnhalle battalions attacked in the direction of Szigetszentmiklós, supported by Hungarian mortars and anti-aircraft guns. The Germans reached the middle of Szigetszentmiklós by 2000, with the Feldherrnhalle assault guns in action well past nightfall, when some houses were in flames. The Axis wielded significant artillery firepower including anti-aircraft and heavy anti-tank guns. The experimental Hungarian 1944 Mace-thrower, or Szálasi, rocket saw its first combat on Csepel Island. An improvised Hungarian artillery unit served these weapons from 23 November to the end of December. Axis forces abandoned the northern half of Szigetszentmiklós on the following day (26 November).