On 18 July, he led 5,000 cavalrymen — who formed a vanguard of Wittgenstein's corps — against Marshal Oudinot in the Battle of Klyastitsy. Taking prisoner 900 enemy soldiers, Kulnev crossed the Drissa River and clashed with a major French contingent. As the Russians came under heavy artillery fire, Kulnev was struck in the legs by a cannonball and lost both limbs. He died from the effects of wounds received at this engagement.