Miraduris did not long survive him; the troops which he had introduced into Anatho caught the contagion of revolt, rose up against him, slew him, and sent his head to Chosroes.
The spring was now approaching, and the time for military operations on a grand scale drew near.

Chosroes, besides his supporters in Mesopotamia, Roman and Persian, had a second army in Azerbijan, raised by his uncles Bindoes and Bostam, which was strengthened by an Armenian contingent.

The plan of campaign involved the co-operation of these two forces.

With this object Chosroes proceeded early in the spring, from Hierapolis to Constantina, from Constantina to Daras, and thence by way of Ammodion to the Tigris, across which he sent a detachment, probably in the neighborhood of Mosul.

This force fell in with Bryzacius, who commanded in these parts for Bahram, and surprising him in the first watch of the night, defeated his army and took Bryzacius himself prisoner.