On September 1 and 2, the unit defended the so-called Fortified Area of Silesia, then it was ordered to support the 55th I.D., which was fighting around Wyry and Kobiór. After several skirmishes with German 28th I.D., the Poles withdrew towards the Nida River. Between September 4 and 20, the Division retreated eastwards, repelling German attacks and beating the enemy in Biłgoraj. On September 19, the Division joined units attacking Tomaszów Lubelski, but these efforts were fruitless. It fought until the capitulation of Army Kraków, September 20.
