He fought in the Polish–Muscovite War from 1609 to 1611, losing a hand during the siege of Smolensk. Supporter of Polish-Swedish peace and alliance against the Muscovy in negotiations ending the Polish–Swedish wars in a truce signed and known as Treaty of Stuhmsdorf in 1635. Took part, bringing his own troops, in the Smolensk War against the Muscovites, but returned early due to poor health.