Ukraine to Muscovite tsar Feodor I. Soon afterward he gathered approximately 2000 men and began a fast march towards the seat of the starost of Cherkasy. Local nobility organised a strong defence composed mainly of their private forces. Little is known of the fate of the campaign. According to Aleksander Wiśniowiecki, Kosiński was killed in a battle against his forces, while the chronicle of Marcin Bielski mentions that Kosiński was found drunk in a guest house and killed in a duel. In the spring of 1593, the Sejm passed a revised Of Niżowcy (O Niżowcach) Act, in which it declared all the remaining forces of Kosiński guilty of high treason and sentenced them to death. The remaining Cossack forces signed an agreement in August of the same year in which the Registered Cossacks could return home with their arms and boats as well as amnesty in exchange for their loyalty. See also Nalyvaiko Uprising Polish–Lithuanian Commonwealth 1591 in the Polish–Lithuanian Commonwealth 1592 in the Polish–Lithuanian Commonwealth 1593 in the Polish–Lithuanian Commonwealth Conflicts in 1591 Conflicts in 1592 Conflicts in 1593 16th-century rebellions 16th century in Ukraine Cossack uprisings Wars involving Poland Warfare of the Early Modern period Rebellions in the Polish–Lithuanian Commonwealth Military history of Ukraine