The behavior of Constantius on this memorable occasion was celebrated with some appearance of justice; and his courtiers compared the studied orations which a Pericles or a Demosthenes addressed to the populace of Athens, with the victorious eloquence which had persuaded an armed multitude to desert and depose the object of their partial choice. The approaching contest with Magnentius was of a more serious and bloody kind. The tyrant advanced by rapid marches to encounter Constantius, at the head of a numerous army, composed of Gauls and Spaniards, of Franks and Saxons; of those provincials who supplied the strength of the legions, and of those barbarians who were dreaded as the most formidable enemies of the republic. The fertile plains of the Lower Pannonia, between the Drave, the Save, and the Danube, presented a spacious theatre; and the operations of the civil war were protracted during the summer months by the skill or timidity of the combatants. Constantius had declared his intention of deciding the quarrel in the fields of Cibalis, a name that would animate his troops by the remembrance of the victory, which, on the same auspicious ground, had been obtained by the arms of his father Constantine. Yet by the impregnable fortifications with which the emperor encompassed his camp, he appeared to decline, rather than to invite, a general engagement. It was the object of Magnentius to tempt or to compel his adversary to relinquish this advantageous position; and he employed, with that view, the various marches, evolutions, and stratagems, which the knowledge of the art of war could suggest to an experienced officer. He carried by assault the important town of Siscia; made an attack on the city of Sirmium, which lay in the rear of the Imperial camp, attempted to force a passage over the Save into the eastern provinces of Illyricum; and cut in pieces a numerous detachment, which he had allured into the narrow passes of Adarne. During the greater part of the summer, the tyrant of Gaul showed himself master of the field. The troops of Constantius were harassed and dispirited; his reputation declined in the eye of the world; and his pride condescended to solicit a treaty of peace, which would have resigned to the assassin of Constans the sovereignty of the provinces beyond the Alps. These offers were enforced by the eloquence of Philip the Imperial ambassador; and the council as well as the army of Magnentius were disposed to accept them. But the haughty usurper, careless of the remonstrances of his friends, gave orders that Philip should be detained as a captive, or, at least, as a hostage; while he despatched an officer to reproach Constantius with the weakness of his reign, and to insult him by the promise of a pardon if he would instantly abdicate the purple. "That he should confide in the justice of his cause, and the protection of an avenging Deity," was the only answer which honor permitted the emperor to return. But he was so sensible of the difficulties of his situation, that he no longer dared to retaliate the indignity which had been offered to his representative. The negotiation of Philip was not, however, ineffectual, since he determined Sylvanus the Frank, a general of merit and reputation, to desert with a considerable body of cavalry, a few days before the battle of Mursa.

The city of Mursa, or Essek, celebrated in modern times for a bridge of boats, five miles in length, over the River Drave, and the adjacent morasses, has been always considered as a place of importance in the wars of Hungary. Magnentius, directing his march towards Mursa, set fire to the gates, and, by a sudden assault, had almost scaled the walls of the town. The vigilance of the garrison extinguished the flames; the approach of Constantius left him no time to continue the operations of the siege; and the emperor soon removed the only obstacle that could embarrass his motions, by forcing a body of troops which had taken post in an adjoining amphitheatre. The field of battle round Mursa was a naked and level plain: on this ground the army of Constantius formed, with the Drave on their right; while their left, either from the nature of their disposition, or from the superiority of their cavalry, extended far beyond the right flank of Magnentius. The troops on both sides remained under arms, in anxious expectation, during the greatest part of the morning; and the son of Constantine, after animating his soldiers by an eloquent speech, retired into a church at some distance from the field of battle, and committed to his generals the conduct of this decisive day. They deserved his confidence by the valor and military skill which they exerted. They wisely began the action upon the left; and advancing their whole wing of cavalry in an oblique line, they suddenly wheeled it on the right flank of the enemy, which was unprepared to resist the impetuosity of their charge. But the Romans of the West soon rallied, by the habits of discipline; and the Barbarians of Germany supported the renown of their national bravery. The engagement soon became general; was maintained with various and singular turns of fortune; and scarcely ended with the darkness of the night. The signal victory which Constantius obtained is attributed to the arms of his cavalry. His