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Magnate, guardian of the eastern borderlands.
Wiśniowiecki participated in the suppression of the Cossack uprising led by Pavlo Pavliuk. The Polish forces defeated the rebels at Lubny, restoring order in the eastern borderlands.
Wiśniowiecki commanded a detachment of Polish forces at Zhovti Vody. The army was defeated by Khmelnytsky's Cossacks, marking the start of the Khmelnytsky Uprising.
Wiśniowiecki defended the fortress of Zbarazh against Khmelnytsky's Cossack-Tatar army. The siege lasted several weeks until relief forces arrived, forcing the Cossacks to withdraw.
Wiśniowiecki fought in the Battle of Berestechko, a major Polish victory over the Cossack-Tatar army. The battle temporarily weakened the Khmelnytsky Uprising.