In a secret interview he produced the portrait of his daughter Eudocia, condescended to flatter the barbarian with the promise of a fair and august bride, obtained an immediate succour of forty thousand horse, and negotiated a strong diversion of the Turkish arms on the side of the Oxus. The Persians, in their turn, retreated with precipitation; in the camp of Edessa, Heraclius reviewed an army of seventy thousand Romans and strangers; and some months were successfully employed in the recovery of the cities of Syria, Mesopotamia, and Armenia, whose fortifications had been imperfectly restored. Shahr Barz still maintained the important station of Chalcedon; but the jealousy of Chosroes, or the artifice of Heraclius, soon alienated the mind of that powerful satrap from the service of his king and country. A messenger was intercepted with a real or fictitious mandate to the cadarigan, or second in command, directing him to send, without delay, to the throne, the head of a guilty or unfortunate general. The despatches were transmitted to Shahr Barz himself; and as soon as he read the sentence of his own death, he dexterously inserted the names of four hundred officers, assembled a military council, and asked the cadarigan whether he was prepared to execute the commands of their tyrant? The Persians unanimously declared that Chosroes had forfeited the sceptre; a separate treaty was concluded with the government of Constantinople; and if some considerations of honour or policy restrained Shahr Barz from joining the standard of Heraclius, the emperor was assured that he might prosecute, without interruption, his designs of victory and peace. Deprived of his firmest support, and doubtful of the fidelity of his subjects, the greatness of Chosroes was still conspicuous in its ruins. The number of five hundred thousand may be interpreted as an oriental metaphor, to describe the men and arms, the horses and elephants, that covered Media and Assyria against the invasion of Heraclius. Yet the Romans boldly advanced from the Araxes to the Tigris, and the timid prudence of Rhazates was content to follow them by forced marches through a desolate country, till he received a peremptory mandate to risk the fate of Persia in a decisive battle. Eastward of the Tigris, at the end of the bridge of Mosul, the great Nineveh had formerly been erected; the city, and even the ruins of the city, had long since disappeared: the vacant space afforded a spacious field for the operations of the two armies. But these operations are neglected by the Byzantine historians, and, like the authors of epic poetry and romance, they ascribe the victory, not to the military conduct, but to the personal valour of their favourite hero. BATTLE OF NINEVEH (627)