Battle of Varna
Władysław appointed Hunyadi (together with his close friend, Nicholas Újlaki) to command the southern defenses in 1441. Hunyadi made several raids against the Ottomans. During his "long campaign" of 1443-1444, the Hungarian forces penetrated as far as Sofia within the Ottoman Empire. The Holy See organized a new crusade, but the Ottomans annihilated the Christian forces at the Battle of Varna in 1444, during which Władysław was killed.