Commanded by Colonel Aleksander Stawarz, it was part of Operational Group "Jasło" of Army Karpaty.

The 2. battalion, led by major Miłek, withdrew on 5 September to the elevated advantageous positions, but against the orders.

Soon afterwards, the Germans, taking advantage of the situation, captured Nowy Sącz, together with bridges, which Polish troops had not destroyed in time.

On 8 September, in Krosno, the tired soldiers did not post sufficient sentries, and the German motorized troops suddenly entered the city, capturing about half of PFC's and officers.

Thus, the brigade ceased to exist; its remnants withdrew towards Brzozów and Bircza, fighting several skirmishes with advancing Wehrmacht.