But in the twentieth month of the siege a marvellous thing befell Zopyrus, son of that Megabyzus who was one of the seven destroyers of the Magus: one of his food-carrying mules gave birth. Zopyrus would not believe the news; but when he saw the foal for himself, he told those who had seen it to tell no one; then reflecting he recalled the Babylonian's word at the beginning of the siege—that the city would be taken when mules gave birth—and having this utterance in mind he conceived that Babylon might be taken; for the hand of heaven, he supposed, was in the man's word and the birth from his own mule.