From the moment that the Romans entered the enemy's country, the country of an active and artful enemy, the order of march was disposed in three columns. The strength of the infantry, and consequently of the whole army was placed in the centre, under the peculiar command of their master-general Victor. On the right, the brave Nevitta led a column of several legions along the banks of the Euphrates, and almost always in sight of the fleet. The left flank of the army was protected by the column of cavalry. Hormisdas and Arinthæus were appointed generals of the horse; and the singular adventures of Hormisdas are not undeserving of our notice. He was a Persian prince, of the royal race of the Sassanides, who, in the troubles of the minority of Sapor, had escaped from prison to the hospitable court of the great Constantine. Hormisdas at first excited the compassion, and at length acquired the esteem, of his new masters; his valor and fidelity raised him to the military honors of the Roman service; and though a Christian, he might indulge the secret satisfaction of convincing his ungrateful country, than at oppressed subject may prove the most dangerous enemy. Such was the disposition of the three principal columns. The front and flanks of the army were covered by Lucilianus with a flying detachment of fifteen hundred light- armed soldiers, whose active vigilance observed the most distant signs, and conveyed the earliest notice, of any hostile approach. Dagalaiphus, and Secundinus duke of Osrhoene, conducted the troops of the rear-guard; the baggage securely proceeded in the intervals of the columns; and the ranks, from a motive either of use or ostentation, were formed in such open order, that the whole line of march extended almost ten miles. The ordinary post of Julian was at the head of the centre column; but as he preferred the duties of a general to the state of a monarch, he rapidly moved, with a small escort of light cavalry, to the front, the rear, the flanks, wherever his presence could animate or protect the march of the Roman army. The country which they traversed from the Chaboras, to the cultivated lands of Assyria, may be considered as a part of the desert of Arabia, a dry and barren waste, which could never be improved by the most powerful arts of human industry. Julian marched over the same ground which had been trod above seven hundred years before by the footsteps of the younger Cyrus, and which is described by one of the companions of his expedition, the sage and heroic Xenophon. "The country was a plain throughout, as even as the sea, and full of wormwood; and if any other kind of shrubs or reeds grew there, they had all an aromatic smell, but no trees could be seen. Bustards and ostriches, antelopes and wild asses, appeared to be the only inhabitants of the desert; and the fatigues of the march were alleviated by the amusements of the chase." The loose sand of the desert was frequently raised by the wind into clouds of dust; and a great number of the soldiers of Julian, with their tents, were suddenly thrown to the ground by the violence of an unexpected hurricane.

The sandy plains of Mesopotamia were abandoned to the antelopes and wild asses of the desert; but a variety of populous towns and villages were pleasantly situated on the banks of the Euphrates, and in the islands which are occasionally formed by that river. The city of Annah, or Anatho, the actual residence of an Arabian emir, is composed of two long streets, which enclose, within a natural fortification, a small island in the midst, and two fruitful spots on either side, of the Euphrates. The warlike inhabitants of Anatho showed a disposition to stop the march of a Roman emperor; till they were diverted from such fatal presumption by the mild exhortations of Prince Hormisdas, and the approaching terrors of the fleet and army. They implored, and experienced, the clemency of Julian, who transplanted the people to an advantageous settlement, near Chalcis in Syria, and admitted Pusæus, the governor, to an honorable rank in his service and friendship. But the impregnable fortress of Thilutha could scorn the menace of a siege; and the emperor was obliged to content himself with an insulting promise, that, when he had subdued the interior provinces of Persia, Thilutha would no longer refuse to grace the triumph of the emperor. The inhabitants of the open towns, unable to resist, and unwilling to yield, fled with precipitation; and their houses, filled with spoil and provisions, were occupied by the soldiers of Julian, who massacred, without remorse and without punishment, some defenceless women. During the march, the Surenas, * or Persian general, and Malek Rodosaces, the renowned emir of the tribe of Gassan, incessantly hovered round the army; every straggler was intercepted; every detachment was attacked; and the valiant Hormisdas escaped with some difficulty from their hands. But the Barbarians were finally repulsed; the country became every day less favorable to the operations of cavalry; and when the Romans arrived at Macepracta, they perceived the ruins of the wall, which had been constructed by the ancient kings of Assyria, to secure their dominions from the incursions of the Medes. These preliminaries of the expedition of Julian appear