Commanded by General Bruno Olbrycht, it was part of the Prusy Army and was concentrated in the area of the Holy Cross Mountains.
It was ordered to defend the Vistula River line between the towns of Dęblin and Kazimierz Dolny.
Due to General Olbrycht's sickness, it was de facto commanded by Colonel Bronisław Duch.
Five days later, it engaged the Wehrmacht in Krasnystaw, then fought the German 4th Light Division near Zamość.
The division took part in the Battle of Tomaszów Lubelski and capitulated on September 26, 1939.