In late 1930s it consisted of these units: The brigade, under Colonel Konstanty Drucki-Lubecki, was part of the Prusy Army and on the night of 31 August /1 September 1939, it unloaded from trains at stations of Rogów and Koluszki, near Łódź.
On 8 September, the 4th Regiment of Niemen Uhlans was attacked by parts of the German 1st Light Division of General Friedrich-Wilhelm von Loeper.
Several soldiers drowned in the Vistula, also the Poles left a lot of equipment on the eastern bank of the river.
On 10 September, the brigade was planned to concentrate in a forest near Łaskarzew, but the only unit that showed up was the 4th Regiment of Niemen Uhlans.
Then it became part of the Operational Cavalry Group of General Władysław Anders and tried to break through to Hungary, after fighting in the Battle of Tomaszów Lubelski.