One of the most dangerous inconveniences of the introduction of the Barbarians into the army and the palace, was sensibly felt in their correspondence with their hostile countrymen; to whom they imprudently, or maliciously, revealed the weakness of the Roman empire. A soldier, of the lifeguards of Gratian, was of the nation of the Alemanni, and of the tribe of the Lentienses, who dwelt beyond the Lake of Constance. Some domestic business obliged him to request a leave of absence. In a short visit to his family and friends, he was exposed to their curious inquiries: and the vanity of the loquacious soldier tempted him to display his intimate acquaintance with the secrets of the state, and the designs of his master. The intelligence, that Gratian was preparing to lead the military force of Gaul, and of the West, to the assistance of his uncle Valens, pointed out to the restless spirit of the Alemanni the moment, and the mode, of a successful invasion. The enterprise of some light detachments, who, in the month of February, passed the Rhine upon the ice, was the prelude of a more important war. The boldest hopes of rapine, perhaps of conquest, outweighed the considerations of timid prudence, or national faith. Every forest, and every village, poured forth a band of hardy adventurers; and the great army of the Alemanni, which, on their approach, was estimated at forty thousand men by the fears of the people, was afterwards magnified to the number of seventy thousand by the vain and credulous flattery of the Imperial court. The legions, which had been ordered to march into Pannonia, were immediately recalled, or detained, for the defence of Gaul; the military command was divided between Nanienus and Mellobaudes; and the youthful emperor, though he respected the long experience and sober wisdom of the former, was much more inclined to admire, and to follow, the martial ardor of his colleague; who was allowed to unite the incompatible characters of count of the domestics, and of king of the Franks. His rival Priarius, king of the Alemanni, was guided, or rather impelled, by the same headstrong valor; and as their troops were animated by the spirit of their leaders, they met, they saw, they encountered each other, near the town of Argentaria, or Colmar, in the plains of Alsace. The glory of the day was justly ascribed to the missile weapons, and well-practised evolutions, of the Roman soldiers; the Alemanni, who long maintained their ground, were slaughtered with unrelenting fury; five thousand only of the Barbarians escaped to the woods and mountains; and the glorious death of their king on the field of battle saved him from the reproaches of the people, who are always disposed to accuse the justice, or policy, of an unsuccessful war. After this signal victory, which secured the peace of Gaul, and asserted the honor of the Roman arms, the emperor Gratian appeared to proceed without delay on his Eastern expedition; but as he approached the confines of the Alemanni, he suddenly inclined to the left, surprised them by his unexpected passage of the Rhine, and boldly advanced into the heart of their country. The Barbarians opposed to his progress the obstacles of nature and of courage; and still continued to retreat, from one hill to another, till they were satisfied, by repeated trials, of the power and perseverance of their enemies. Their submission was accepted as a proof, not indeed of their sincere repentance, but of their actual distress; and a select number of their brave and robust youth was exacted from the faithless nation, as the most substantial pledge of their future moderation. The subjects of the empire, who had so often experienced that the Alemanni could neither be subdued by arms, nor restrained by treaties, might not promise themselves any solid or lasting tranquillity: but they discovered, in the virtues of their young sovereign, the prospect of a long and auspicious reign. When the legions climbed the mountains, and scaled the fortifications of the Barbarians, the valor of Gratian was distinguished in the foremost ranks; and the gilt and variegated armor of his guards was pierced and shattered by the blows which they had received in their constant attachment to the person of their sovereign. At the age of nineteen, the son of Valentinian seemed to possess the talents of peace and war; and his personal success against the Alemanni was interpreted as a sure presage of his Gothic triumphs.

While Gratian deserved and enjoyed the applause of his subjects, the emperor Valens, who, at length, had removed his court and army from Antioch, was received by the people of Constantinople as the author of the public calamity. Before he had reposed himself ten days in the capital, he was urged by the licentious clamors of the Hippodrome to march against the Barbarians, whom he had invited into his dominions; and the citizens, who are always brave at a distance from any real danger, declared, with confidence, that, if they were supplied with arms, they alone would undertake to deliver the province from the ravages of an insulting foe. The vain reproaches of an ignorant multitude hastened the downfall of the Roman empire; they provoked the desperate rashness of Valens; who did not find, either in his