The Romans lost four tribunes and 243 soldiers in this memorable battle of Strasburg, which was so glorious to the cæsar and so salutary to the afflicted provinces of Gaul. Six thousand of the Alamanni were slain in the field, without including those who were drowned in the Rhine, or transfixed with darts while they attempted to swim across the river. Chnodomar himself was surrounded and taken prisoner, with three of his brave companions who had devoted themselves to follow in life or death the fate of their chieftain. Julian received him with military pomp in the council of his officers; and expressing a generous pity for the fallen state, dissembled his inward contempt for the abject humiliation of his captive. Instead of exhibiting the vanquished king of the Alamanni, as a grateful spectacle to the cities of Gaul, he respectfully laid at the feet of the emperor this splendid trophy of his victory. Chnodomar experienced an honourable treatment, but the impatient barbarian could not long survive his defeat, his confinement, and his exile.
After Julian had repulsed the Alamanni from the provinces of the upper Rhine, he turned his arms against the Franks, who were seated nearer to the ocean on the confines of Gaul and Germany; and who, from their numbers, and still more from their intrepid valour, had ever been esteemed the most formidable of the barbarians. Although they were strongly actuated by the allurements of rapine, they professed a disinterested love of war, which they considered as the supreme honour and felicity of human nature; and their minds and bodies were so completely hardened by perpetual action, that, according to the lively expression of an orator, the snows of winter were as pleasant to them as the flowers of spring. In the month of December which followed the battle of Strasburg, Julian attacked a body of six hundred Franks, who had thrown themselves into two castles on the Mosa. In that severe season they sustained, with inflexible constancy, a siege of fifty-four days; till at length, exhausted by hunger, and satisfied that the vigilance of the enemy in breaking the ice of the river left them no hopes of escape, the Franks consented, for the first time, to dispense with the ancient law, which commanded them to conquer or to die.
The cæsar at once sent his captives to the court of Constantius, who, accepting them as a valuable present, rejoiced in the opportunity of adding so many heroes to the choicest troops of his domestic guards. The obstinate resistance of this handful of Franks apprised Julian of the difficulties of the expedition which he meditated for the ensuing spring, against the whole body of the nation. His rapid diligence surprised and astonished the active barbarians. Ordering his soldiers to provide themselves with biscuit for twenty days, he suddenly pitched his camp near Tongres, while the enemy still supposed him in his winter quarters at Paris, expecting the slow arrival of his convoys from Aquitania. Without allowing the Franks to unite or deliberate, he skilfully spread his legions from Cologne to the ocean; and by the terror as well as by the success of his arms, soon reduced the suppliant tribes to implore the clemency and to obey the commands of their conqueror. The Chamavians submissively retired to their former habitations beyond the Rhine, but the Salians were permitted to possess their new establishment of Toxandria as the subjects and auxiliaries of the Roman Empire. The treaty was ratified by solemn oaths, and perpetual inspectors were appointed to reside among the Franks with the authority of enforcing the strict observance of the conditions. An incident is related, interesting enough in itself and by no means repugnant to the character of Julian, who ingeniously contrived both the plot and the catastrophe of the tragedy. When the Chamavians sued for peace, he required the son of their king as the only hostage on whom he could rely. A mournful silence, interrupted by tears and groans, declared the sad perplexity of the barbarians; and their aged chief lamented in pathetic language that his private loss was now embittered by a sense of the public calamity. While the Chamavians lay prostrate at the foot of his throne, the royal captive, whom they believed to have been slain, unexpectedly appeared before their eyes; and as soon as the tumult of joy was hushed into attention, the cæsar addressed the assembly in the following terms: “Behold the son, the prince whom you wept. You had lost him by your fault. God and the Romans have restored him to you. I shall still preserve and educate the youth, rather as a monument of my own virtue than as a pledge of your sincerity. Should you presume to violate the faith which you have sworn, the arms of the republic will avenge the perfidy not on the innocent but on the guilty.” The barbarians withdrew from his presence, impressed with the warmest sentiments of gratitude and admiration.