During the long period of the reign of Constantius, the provinces of the East were afflicted by the calamities of the Persian war. 5813 The irregular incursions of the light troops alternately spread terror and devastation beyond the Tigris and beyond the Euphrates, from the gates of Ctesiphon to those of Antioch; and this active service was performed by the Arabs of the desert, who were divided in their interest and affections; some of their independent chiefs being enlisted in the party of Sapor, whilst others had engaged their doubtful fidelity to the emperor. 59 The more grave and important operations of the war were conducted with equal vigor; and the armies of Rome and Persia encountered each other in nine bloody fields, in two of which Constantius himself commanded in person. 60 The event of the day was most commonly adverse to the Romans, but in the battle of Singara, their imprudent valor had almost achieved a signal and decisive victory. The stationary troops of Singara 6011 retired on the approach of Sapor, who passed the Tigris over three bridges, and occupied near the village of Hilleh an advantageous camp, which, by the labor of his numerous pioneers, he surrounded in one day with a deep ditch and a lofty rampart. His formidable host, when it was drawn out in order of battle, covered the banks of the river, the adjacent heights, and the whole extent of a plain of above twelve miles, which separated the two armies. Both were alike impatient to engage; but the Barbarians, after a slight resistance, fled in disorder; unable to resist, or desirous to weary, the strength of the heavy legions, who, fainting with heat and thirst, pursued them across the plain, and cut in pieces a line of cavalry, clothed in complete armor, which had been posted before the gates of the camp to protect their retreat. Constantius, who was hurried along in the pursuit, attempted, without effect, to restrain the ardor of his troops, by representing to them the dangers of the approaching night, and the certainty of completing their success with the return of day. As they depended much more on their own valor than on the experience or the abilities of their chief, they silenced by their clamors his timid remonstrances; and rushing with fury to the charge, filled up the ditch, broke down the rampart, and dispersed themselves through the tents to recruit their exhausted strength, and to enjoy the rich harvest of their labors. But the prudent Sapor had watched the moment of victory. His army, of which the greater part, securely posted on the heights, had been spectators of the action, advanced in silence, and under the shadow of the night; and his Persian archers, guided by the