The Arabs crossed the Euphrates and spread themselves over Mesopotamia; the Khazars invaded Armenia and Azerbijan; rumor said that the Greek emperor had taken the field and was advancing on the side of Syria, at the head of 80,000 men; above all, it was quite certain that the Great Khan of the Turks had put his hordes in motion, had passed the Oxus with a countless host, occupied Balkh and Herat, and was threatening to penetrate into the very heart of Persia.
The perilous character of the crisis is perhaps exaggerated; but there can be little doubt that the advance of the Turks constituted a real danger.

Hormisdas, however, did not even now quit the capital, or adventure his own person.

He selected from among his generals a certain Varahran or Bahram, a leader of great courage and experience, who had distinguished himself in the wars of Anushirwan, and, placing all the resources of the empire at his disposal, assigned to him the entire conduct of the Turkish struggle.

Bahram is said to have contented himself with a small force of picked men, veterans between forty and fifty years of age, to have marched with them upon Balkh, contended with the Great Khan in several partial engagements, and at last entirely defeated him in a great battle, wherein the Khan lost his life.

This victory was soon followed by another over the Khan's son, who was made prisoner and sent to Hormisdas.