After a successful withdrawal through Włocławek (September 7) and Toruń, the division took part in the battle of Bzura. It successfully assaulted the German positions and liberated Łowicz, the main pivot of the German defences in the area. However, in the effect of conflicting orders from Gen. Władysław Bortnowski, the division was then withdrawn back to its initial positions on the northern bank of the Bzura river, and was then ordered to recapture the town again. The task was accomplished, but this time with much higher casualties. After heavy street-to-street fighting, the town was almost completely razed to the ground and the division was reduced to merely a third of its initial strength and had to be withdrawn from combat. The remnants of the division broke through from the battle, but were then surrounded and destroyed in the battle of the Kampinos Forest of September 19.