Transylvanian campaign into Poland (1657)

The Transylvanian campaign into Poland (Swedish: Transsylvaniens kampanj in i Polen; Ukrainian: Трансільванський похід на Польщу) also called the Brest Campaign or Rakoczy's Campaign (Polish: Najazd Rakoczego) was a campaign by Transylvania, Sweden, and the Cossack Hetmanate into the Polish–Lithuanian Commonwealth during the Deluge in 1657. The allied army saw success in the beginning, but when Denmark declared war on Sweden, Charles abandoned the Transylvanians, which led to their defeat. During the campaign, the allied forces successfully managed to capture both Warsaw and Brest from the Poles but were later pushed out from the country after the forces of Stefan Czarniecki intervened in the conflict.