The Siberian Brigade was a fresh unit, formed out of remains of 5th Division (Colonel Walerian Czuma), soldiers of the former Blue Army, and volunteers, including a number of boyscouts and high school students (among the volunteers were two classes from a boys' high school in Łódź, who had only two weeks of training).

On 14 August Captain Jozef Werobej decided to push the Soviets out of Popielzyn-Zawady, in order to secure the Wkra crossings and open the way towards Nowe Miasto.

Cieksyn was lost, and Polish forces in the area, after losing almost all of the officers, retreated to the western bank of the Wkra.

On the night of 14-15 August Polish forces in the area were ordered by General Sikorski to continue their advance, regardless of the losses.

With positions on the eastern bank of the river, Polish Army achieved strategic advantage for its future attacks towards Nasielsk and Pułtusk.