21st Vistula Uhlan Regiment

21st Vistula Uhlan Regiment (Polish: 21 Pulk Ulanów Nadwislanskich, 21 p.ul.) was a cavalry unit of the Polish Army in the Second Polish Republic. Formed in 1920, it fought both in the Polish–Soviet War and the Invasion of Poland. The regiment was garrisoned in the town of Rowne, Volhynia, and in 1939 belonged to Volhynian Cavalry Brigade.

The regiment was formed in July 1920, during the Polish–Soviet War, as the 11th Mounted Border Rifles Regiment (11 Pulk Konnych Strzelcow Granicznych). Its cadre consisted of NCOs, trained at two military schools, in Ciechanów and Stara Wies near Warsaw. Due to efforts of Colonel Bronislaw Zaniewski, who commanded the Border Rifles, a cavalry regiment was created, based on the NCOs from both schools. On July 24, 1920, NCO's from Ciechanów, commanded by Bohdan Dabrowski, arrived at Stara Wies, and Dabrowski himself was appointed commandant of the whole regiment.

In early August 1920, Colonel Aleksander Kunicki arrived at Stara Wies. His task was to form four squadrons and a platoon of heavy machine guns. On August 7, the regiment was placed under authority of the military governor of Warsaw, who ordered it to march towards Radzymin and then Stara Milosna, on August 8, 1920. The Vistula Uhlans fought with distinction in the Battle of Warsaw (1920).

On August 16, 1920, the regiment was transported by rail to Kutno, and then marched off to Płock. As Polish offensive had begun, the regiment crossed the Vistula near Wyszogród (August 20), chasing after the retreating Soviet cavalry of Hayk Bzhishkyan. Unable to escape Polish encirclement, Soviet forces entered East Prussia near Kolno.

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