It consisted of several units, garrisoned in several towns located in northeast part of pre-1939 Poland: The Brigade, commanded by General Władysław Anders, was mobilized as early as March 23, 1939 and, together with Polish 20th Infantry Division (also garrisoned in Baranowicze), was transported to the area of Sierpc and Płock.
On September 4 it organized a successful counterattack, but after Polish positions had been broken, the Brigade had to withdraw south.
The assault began on September 13, together with the Wielkopolska Cavalry Brigade the Poles attacked German 11th I.D.
After that, General Rommel ordered the Brigade to move towards Lublin, as mounted troops were of no use in urban warfare in Warsaw.
Upon reaching the area of Lublin, the Brigade became part of Northern Front, commanded by General Stefan Dąb-Biernacki.