Twelve years have passed since the disastrous Crusader Battle of Varna and three years since the fall of Constantinople to the Ottoman Empire in 1453. Europe is reeling under the relentless pressure of Ottoman advances: Serbia fell in 1455, and Sultan Mehmed II had now amassed his forces for an invasion of the Kingdom of Hungary. To launch this invasion, he first needs the fortress town of Belgrade... Dur: 20mins File: .mp3