After eventually taking control of Warsaw in January 1945, the First Army took part in the Vistula–Oder Offensive. Subsequently it fought in Pomerania, breaking through the Pomeranian Wall ("Pommernstellung") fortified line and capturing Fortress Kolberg, a heavily fortified city, in March. In April–May 1945, the First Army took part in the Soviet invasion of Germany and the final capture of Berlin.