In 1652 Sobieski fought against the Cossacks near Bracław and during Biała Cerkiew campaign. Marching with Jan Odrzywolski, but without his own hussar banner, Sobieski and his retinue came to the field hetman Kalinowski's camp at Batoh on May 31. Marek Sobieski and Odrzywolski were assigned to command cavalry banners during the subsequent battle, and in that capacity they fought on June 1 and 2. On June 2, during the second day of the Battle of Batoh after the defeat of Polish cavalry in the field before the Polish camp, Sobieski commanded a cavalry group, perhaps containing wounded field hetman Kalinowski, that withdrew to the eastern redoubt in Polish camp, where Cossacks destroyed them after bringing artillery. Following Polish soldier Wespazjan Kochowski's writings Sobieski might have been the last Polish commander defending the Polish camp against the Cossack-Tatar army. Young commander was taken prisoner or surrendered, to be ransomed in a future as it was practice of the day, by the Tatars or Cossacks. After the battle, the Cossacks paid the Tatars for possession of the prisoners, and killed the Polish captives in retaliation for Chmielnicki's defeat at Berestechko. Among the 8,000 massacred Polish soldiers was Marek Sobieski. or the number could have been much higher, up to 15,000 killed in action and massacred.