By the summer of 1919, squadrons of the brigade were sent to the eastern front, to reinforce the Lithuanian–Belarusian Division in the ongoing Polish-Soviet War. The regiment fought in the territory of current Belarus, advancing from Baranowicze towards Minsk and Bobrujsk. In September 1919, the regiment was incorporated into 2nd Cavalry Brigade of the Polish Army. In the winter of 1919/1920, and early spring 1920, it fought in Polesie, around Mozyr. In May, during the Kiev Offensive (1920), the regiment was ordered to reach the Dniepr river, which was achieved on May 8. After the Soviet counteroffensive, Polish forces withdrew, with the uhlans covering the infantry.