Despot George was neutral during the Polish-Lithuanian (1444) and Hungarian-Wallachian (1448) crusades. In 1455, he was wounded and imprisoned during clashes with the Hungarians, after which the young Sultan Mehmed II launched the siege of Belgrade and its large Hungarian garrison. Despot Đurađ died at the end of 1456, due to complications stemming from the wound. After his death, Serbia, Bosnia and Albania (West Balkans) became practically annexed by sultan Mehmed II, which only ended after centuries of additional conquests of Byzantine lands.