World War II 4th Niemen Uhlan Regiment (Polish: 4 Pulk Ulanów Zaniemenskich, 4 pul.)

In the spring of 1918, General Józef Dowbor-Muśnicki ordered the formation of 4th Uhlan Regiment, as part of Polish I Corps in Russia.

The idea was abandoned, to return in November 1918, when the regiment was formed in Warsaw, with its squadrons scattered in towns of former Congress Poland, such as Łomża, Mława, Płock, Włocławek, Białystok, and Konin.

Following the Polish victory in the Battle of Warsaw (1920), it chased the retreating enemy, reaching the line of the Berezina River.

On 8 September south of Radom, 4th Regiment of Niemen Uhlans fought a bloody battle against advancing panzer units of the Wehrmacht.

As part of improvised Cavalry Brigade of General Władysław Anders, it fought its way southwards, trying to reach the Hungarian border.

The second flag was funded by the residents of the lands of Lida, Minsk and Ejszyszki, and presented to the soldiers by Marshall Józef Piłsudski in Wilno, on 14 April 1922.