He played a major role, often as the top commander of the Commonwealth forces, in the Wallachian campaign of 1599–1600, the Polish–Swedish War of 1600–11, the Polish–Muscovite War of 1605–18, and the Polish–Ottoman War of 1620–21. His most famous victory was the Battle of Kircholm in 1605, in which he dealt a major defeat to a Swedish army three times the size of his own. He died on the front lines during the battle of Chocim, in the besieged Khotyn Fortress, a few days before the Ottomans gave up on the siege and agreed to negotiate.