On September 8, 1655, Swedish forces under King Charles X Gustav entered Warsaw, which had been abandoned by John II Casimir of Poland on August 18.

At the same time, in the village of Mogilno near Zakroczym, Mazovian levée en masse gathered to fight the invaders.

Swedish forces, including such units, as Jämtlands fältjägarregemente and Norrlands dragonregemente, sent from Warsaw to face the Poles, decided to cross the Narew near Nowy Dwor Mazowiecki.

Their commandant, Gustaf Otto Stenbock was well aware of the fact that in previous battles, the Polish szlachta of the levée en masse had capitulated to the Swedes without fighting.

This star-shaped military camp was main supply depot and concentration point of the Swedish-Brandenburgian army during the Battle of Warsaw.