On September 8, 1655, Swedish forces under King Charles X Gustav entered Warsaw, which had been abandoned by Jan Kazimierz on August 18. At the same time, in the village of Mogilno near Zakroczym, Mazovian levee en masse gathered to fight the invaders. It was commanded by Voivode of Plock, Jan Kazimierz Krasinski. 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.