3. Then the Cæsar, like an experienced general, fearing that the barbarians might take advantage of some moonless night to cross over the river, which was now thoroughly frozen, ordered soldiers to go up and down the stream every day in light boats, from sunset till daybreak, so as to break the crust of ice and prevent any one from escaping in that manner. Owing to this manoeuvre, the barbarians were so exhausted by hunger, watching, and the extremity of despair, that at last they voluntarily surrendered, and were immediately sent to the court of the emperor. 4. And a vast multitude of Franks, who had come to their assistance, hearing that they were taken prisoners and sent off, would not venture on any further enterprise, but returned to their own country. And when this affair was finished, the Cæsar retired to Paris to pass the winter there. III. § 1. It was now expected that a number of tribes would unite in greater force, and therefore the prudent Julian, bearing in mind the uncertainties of war, became very anxious and full of care. And as he thought that the truce lately made, though not free from trouble, and not of long duration, still gave him opportunity to remedy some things which were faulty, he began to remodel the arrangements about tribute. 2. And when Florentius, the prefect of the prætorium, having taken an estimate of everything, affirmed that whatever deficiency there might be in the produce of a capitation tax he should be able to make good from what he could levy by force, Julian, deprecating this practice, determined to lose his own life rather than permit it. 3. For he knew that the wounds inflicted by such extortions, or, as I should rather call them, confiscations, are incurable, and have often reduced provinces to extreme destitution. Indeed, such conduct, as will be related hereafter, utterly lost us Illyricum. 4. And when, owing to this resolution of his, the prætorian prefect exclaimed that it could not be endured that he, to whom the emperor had intrusted the chief authority in this matter, should be thus distrusted, Julian attempted to appease him, showing by exact and accurate calculations that the capitation tax was not only enough, but more than enough to provide all the necessary supplies.