 As Polish momentum weakened, on September 13 the Brigade was ordered to withdraw across the Bzura near Brochow, continuously fighting the German 4th Mountain Division of General Georg-Hans Reinhardt.Skirmishes lasted until September 16, when the Brigade retreated into the Kampinos Forest.There, together with the Pomeranian Cavalry Brigade and Podolska Cavalry Brigade, it created the Joint Cavalry Brigade of General Abraham.