By the evening of September 9, the regiment reached Zyznow, and on the next day in the morning, it crossed the San river. It was then ordered to provide rear guard for the units of the 24th Infantry Division, marching towards Bircza. On September 12, the regiment reached the village of Borownica. Since it had already been captured by the enemy, Colonel Beniamin Kotarba decided to assault the Germans. After a bloody clash during which the Poles were unable to push back the enemy, the regiment was dispersed and its soldiers were ordered to try to reach Polish positions near Lwow. Colonel Kotarba himself was killed in action. The flag of the regiment, which featured a Silver Eagle and the Black Madonna of Czestochowa, was handed to its soldiers on October 19, 1924, by General Stanislaw Haller. It was funded by the residents of the counties of Rzeszow, Mielec, Pilzno and Ropczyce. The flag was buried in September 1939 by the soldiers of the regiment. In the summer 1944, it was found and handed over to the 17th I.R. of the Polish People's Army.