Service in these regions had no mitigations, there was little or no loot, and since serious operations had ceased, little excitement; the long holiday and cessation of the ordinary routine gave the camp agitators their opportunity. Three legions were concerned, the eighth, the ninth, and the fifteenth. The first open act of mutiny was an attempt to combine all three in one. This failed, owing to the mutual jealousies of the legions, neither of the three being willing to be enrolled under the name of one of the others, and a compromise was effected by uniting the legions locally, but retaining their separate organization. The rapid and dramatic account of Tacitus, in which only the most picturesque incidents are recorded and grouped together for effect, conceals the fact that this was a very serious step, for the legions were not quartered together, and must have marched some distance in order to unite. This event, which Tacitus places at the beginning of his summary, can only have taken place after the officers had lost the control of their men, unless we are to credit these officers, who knew that there was much disaffection, and had already reported it to Rome, with such blind folly as to have united troops ready to mutiny. The speech which Tacitus puts into the mouth of one Percennius, the arch agitator, a private who had been accustomed to lead a claque in the Roman theatres, and was well versed in the arts by which factions are organized, gives a clear summary of the grievances of the Roman soldier of the period, but will not be intelligible without a little previous explanation. First comes the question of discharge. A Roman citizen was constitutionally liable to be called out for service between the ages of eighteen and forty-six, but it was held that sixteen years of service, whether continuous or intermittent, exempted a man from further duty. The difficulty of finding recruits had caused the claim to exemption to be ignored, and as the army had become increasingly professional, losing its character of a militia, the men themselves, for lack of other occupation, had helped the authorities to expand the period of service. In order further to swell the numbers of the army, the Romans had anticipated the “garrison” service recently introduced into the English army. Time-expired men were enrolled in companies outside the organization of the legion; they were called flagmen (vexillarii); they could not be called upon to march in a campaign, but they formed a kind of permanent garrison in the countries in which they were employed; they were not a “reserve,” for they could not be called back to the colours, but they relieved the regular soldiers of duties, for which there was a dearth of men; they were also employed as engineers, for we find some of them in the course of this mutiny detached to build roads and bridges near Nauportus.