The Soviet offensive was resumed on 12 January 1945. On 17 January the First Polish Army led by General Stanisław Popławski entered the destroyed Warsaw. It fought on the 1st Belorussian Front and during the following month participated in overcoming strongly fortified German defenses at the Pomeranian Wall, losing 6,500 soldiers; in March it took Kolberg. The 1st Armoured Brigade fought within the 2nd Belorussian Front and contributed to the liberation of Gdańsk and Gdynia. The First Army forced its way across the Oder River on 16–17 April and reached the Elbe near Spandau on 3 May. Its 1st Tadeusz Kościuszko Infantry Division and other Polish formations participated in the final Battle of Berlin. The Second Polish Army, led by General Karol Świerczewski, operated with the 1st Ukrainian Front. It crossed the Lusatian Neisse on 16 April and heading for Dresden suffered heavy losses at the Battle of Bautzen, due to poor command. However, a German rescue force heading for Berlin was stopped. Helping to defeat Nazi Germany in Poland, the two Polish armies suffered losses equal to the Polish military losses encountered during the September Campaign of 1939—66,000 soldiers killed (according to Antoni Czubiński).