Upon this, the Armenians and Iberians broke out in open revolt. Vartan, the Mamigonian, repenting of his weakness, abjured his new creed, resumed the profession of Christianity, and made his peace with Joseph, the patriarch. He then called the people to arms, and in a short time collected a force of a hundred thousand men. Three armies were formed, to act separately under different generals. One watched Azerbijan, or Media Atropatene, whence it was expected that their main attack would be made by the Persians; another, under Vartan, proceeded to the relief of Albania, where proceedings were going on similar to those which had driven Armenia into rebellion; the third, under Vasag, occupied a central position in Armenia, and was intended to move wherever danger should threaten. An attempt was at the same time made to induce the Roman emperor, Marcian, to espouse the cause of the rebels, and send troops to their assistance; but this attempt was unsuccessful. Marcian had but recently ascended the throne, and was, perhaps, scarcely fixed in his seat. He was advanced in years, and naturally unenterprising. Moreover, the position of affairs in Western Europe was such that Marcian might expect at any moment to be attacked by an overwhelming force of northern barbarians, cruel, warlike, and unsparing. Attila was in A.D. 451 at the height of his power; he had not yet been worsted at Chalons; and the terrible Huns, whom he led, might in a few months destroy the Western, and be ready to fall upon the Eastern empire. Armenia, consequently, was left to her own resources, and had to combat the Persians single-handed. Even so, she might probably have succeeded, have maintained her Christianity, or even recovered her independence, had her people been of one mind, and had no defection from the national cause manifested itself. But Vasag, the Marzpan, had always been half-hearted in the quarrel; and, now that the crisis was come, he determined on going wholly over to the Persians. He was able to carry with him the army which he commanded; and thus Armenia was divided against itself; and the chance of victory was well-nigh lost before the struggle had begun. When the Persians took the field they found half Armenia ranged upon their side; and, though a long and bloody contest followed, the end was certain from the beginning. After much desultory warfare, a great battle was fought in the sixteenth year of Isdigerd (A.D. 455 or 456) between the Christian Armenians on the one side, and the Persians, with their Armenian abettors, on the other. The Persians were victorious; Vartan, and his brother, Hemaiiag, were among the slain; and the patriotic party found that no further resistance was possible. The patriarch, Joseph, and the other bishops, were seized, carried off to Persia, and martyred. Zoroastrianism was enforced upon the Armenian nation. All accepted it, except a few, who either took refuge in the dominions of Rome, or fled to the mountain fastnesses of Kurdistan.