In 1520, Solyman, called the Magnificent, overran Bosnia, and advancing to the Danube, besieged and captured Belgrade, which strong fortress was considered the only reliable barrier against his encroachments. At the same time his fleet took possession of the island of Rhodes. After some slight reverses, which the Turks considered merely embarrassments, they resumed their aggressions, and Solyman, in 1525, again crossing the Danube, entered Hungary with an army of two hundred thousand men. Louis, who was then King of Hungary, brother of the wife of Ferdinand, was able to raise an army of but thirty thousand to meet him. With more courage than discretion, leading this feeble band, he advanced to resist the foe. They met on the plains of Mohatz. The Turks made short work of it. In a few hours, with their cimeters they hewed down nearly the whole Christian army. The remnant escaped as lambs from wolves. The king, in his heavy armor, spurred his horse into a stream to cross in his flight. In attempting to ascend the bank, the noble charger, who had borne his master bravely through the flood, fell back upon his rider, and the dead body of the king was afterward picked up by the Turks, covered with the mud of the morass. All Hungary would now have fallen into the hands of the Turks had not Solyman been recalled by a rebellion in one of his own provinces. It was this event which placed the crowns of Bohemia and Hungary on the brow of Ferdinand, and by annexing those two kingdoms to the Austrian States, elevated Austria to be one of the first powers in Europe. Ferdinand, thus strengthened sent ambassadors to Constantinople to demand the restitution of Belgrade and other important towns which the Turks still held in Hungary. "Belgrade!" exclaimed the haughty sultan, when he heard the demand. "Go tell your master that I am collecting troops and preparing for my expedition. I will suspend at my neck the keys of my Hungarian fortresses, and will bring them to that plain of Mohatz where Louis, by the aid of Providence, found defeat and a grave. Let Ferdinand meet and conquer me, and take them, after severing my head from my body! But if I find him not there, I will seek him at Buda or follow him to Vienna."