Murad, when he heard, at Brusa, of this mad outbreak, returned with all haste to Europe, and organized resistance to it, in concert with the Greek Emperor. They agreed that the two rebels, when captured, should be deprived of their eyesight. Murad thereupon, taking what soldiers he could get together, marched to meet Saoudji’s army. When within hearing of it, he called out to the soldiers by night, urging them to return to their duty and promising pardon to them. The soldiers, hearing the voice of the Sultan, who had so often led them to victory, repented of their treachery and deserted the cause which they had so foolishly taken up. Saoudji and Andronicus and the band of Greek nobles, thus deserted by the rank and file of the army, took refuge in the fortress of Demotika. Murad had no difficulty in capturing this place, and with it the two rebel princes and the Greek nobles. In pursuance of his agreement with the Emperor, he then deprived his own son of his eyesight and, going beyond his promise, had the young man executed. He caused the Greek nobles to be bound, two and three together, and thrown into the Maritza, while he stood on the bank and revelled in the sight of their drowning struggles. In some cases he insisted on parents themselves putting their sons to death in his presence. When they refused, the parents were drowned in the river together with their sons. In this instance Murad showed that he had in him the vein of cruelty which was conspicuous, more or less, in all the descendants of Othman. Andronicus was handed over to the Greek Emperor, who partially, but not completely, carried out his promise of depriving his grandson of eyesight. As a result of these events, the Emperor John Palæologus found himself compelled to enter into another treaty with Murad, by which, in order “that he might enjoy up to the end of his life in peace his last possession,” he recognized himself as vassal of the Sultan, promised to do military service in the Ottoman army, and gave his son Manuel in charge of Murad as a hostage. 2. THE CONQUESTS IN MACEDONIA, BULGARIA, AND SERBIA.