5. After this, the next measure of urgent necessity was to repair the walls of the recovered cities, while as yet no one raised any hindrance; and it is abundantly plain that at that time the barbarians did out of fear what was commanded them for the public interests, while the Romans did it for love of their ruler. 6. According to the treaty made in the preceding year, the kings sent their own waggons with many articles useful for building. And the auxiliary soldiers who always hold themselves above employments of this kind being won over by Julian's caresses to diligent obedience, now carried beams fifty feet long and more on their shoulders, and gave the greatest aid to the labours of the architect. 7. And while all this was being done with diligence and speed, Hariobaudes, having learnt all he wanted, returned and related what he had ascertained. And after his arrival the army marched with all speed, and soon reached Mayence, where, though Florentius and Lupicinus, who succeeded Severus, insisted vehemently that they might cross by the bridge laid down at that town, the Cæsar strenuously objected, maintaining that it was not well to trample on the lands of those who were brought into a state of tranquillity and friendship; lest the treaty made with them should be brought to an abrupt end, as had often happened through the discourtesy of the soldiers ravaging everything that came in their way. 8. But all the Allemanni who were the objects of our attack, seeing the danger now on their borders, with many threats urged Surmarius their king, who by a previous treaty was on friendly terms with us, to prevent the Romans from crossing the river. For their villages were on the eastern bank of the Rhine. But when Surmarius affirmed that he by himself was unable to offer effectual resistance, the barbarian host assembled in a body, and came up to Mayence, intending by main force to prevent our army from crossing the river. 9. So that Cæsar's advice now seemed best in two points, both not to ravage the lands of our friends; and also, not in the teeth of the opposition of a most warlike people, to risk the loss of many lives in order to make a bridge, even in a spot the most favourable for such a work. 10. And the enemy, watching his movements with great skill, marched slowly along the opposite bank, and when they saw our men pitching their tents at a distance, they still watched all night, exerting the most sleepless vigilance to prevent the passage of the river from being attempted. 11. But when our men reached the spot intended, they surrounded their camp with a rampart and ditch, and took their rest; and the Cæsar, having taken counsel with Lupicinus, ordered some of the tribunes to get ready three hundred light-armed soldiers with stakes, without letting them know what was to be done, or whither they were going.