Battle of Varna
At the time of the initial Ottoman encroachment, the Hungarians successfully resisted conquest. John Hunyadi was leader of the Crusade of Varna, in which the Hungarians tried to expel the Turks from the Balkans. Initially, they were successful, but later at the Battle of Varna, the Ottomans won a decisive if Pyrrhic victory. Wladyslaw III was decapitated during this battle.