Masovian Cavalry Brigade

Its headquarters were in Warsaw, with other units stationed in towns around the capital: The Brigade, under Colonel Jan Karcz, was part of the Modlin Army.

Facing encirclement, the Brigade had to withdraw to the second line of defence, on the night of September 1/2.

In the morning of September 2, the Wehrmacht began a frontal attack and after several hours of heavy fights the Germans captured important Hill 190,5.

This manoeuver opened right wing of the neighboring Polish 20th Infantry Division and on September 3, the Germans broke the lines.

On that day it was absorbed by the Polish 5th Infantry Division under General Juliusz Zulauf, and ordered to defend the line of the Narew river.