[Sidenote: Change in the organization of the legions.]
There was a change in the constitution and disposition of the legion after the time of Marius, until the fall of the republic. The legions were thrown open to men of all grades; they were all armed and equipped alike; the lines were reduced to two, with a space between each cohort, of which there were five in each line; the young soldiers were placed in the rear, and not the van; the distinction between Hastati, Principes, and Triarii ceased; the Velites disappeared, their work being done by the foreign mercenaries; the cavalry ceased to be part of the legion, and became a distinct body; and the military was completely severed from the rest of the state. Formerly no one could aspire to office who had not completed ten years of military service, but in the time of Cicero a man could pass through all the great dignities of the state with a very limited experience of military life. Cicero himself served but one campaign.
[Sidenote: Changes under the emperors.]
[Sidenote: Pay of soldiers.]
Under the emperors, there were still other changes. The regular army consisted of legions and supplementa—the latter being subdivided into the imperial guards and the auxiliary troops. The auxiliaries (Socii) consisted of troops from the states in alliance with Rome, or those compelled to furnish subsidies. The infantry of the allies was generally more numerous than that of the Romans, while the cavalry was three times as numerous. All the auxiliaries were paid by the state; the infantry received the same pay as the Roman infantry, but the cavalry only two thirds of what was paid to the Roman cavalry. The common foot-soldier received in the time of Polybius three and a half asses a day, equal to about six farthings sterling money; the horseman three times as much. The Praetorian cohorts received twice as much as the legionaries. Julius Caesar allowed about six asses a day as the pay of the legionary, and under Augustus the daily pay was raised to ten asses—little more than four pence per day. Domitian raised the stipend still higher. The soldier, however, was fed and clothed by the government.
[Sidenote: The Praetorian cohort.]
The Praetorian cohort was a select body of troops instituted by Augustus to protect his person, and consisted of ten cohorts, each of one thousand men, chosen from Italy. This number was increased by Vitellius to sixteen thousand, and they were assembled by Tiberius in a permanent camp, which was strongly fortified. They had peculiar privileges, and when they had served sixteen years, received twenty thousand sesterces, or more than one hundred pounds sterling. Each Praetorian had the rank of a centurion in the regular army. Like the body-guard of Louis XIV., they were all gentlemen, and formed gradually a great power, like the janissaries at Constantinople, and frequently disposed of the purple itself. It would thus appear that the centurion only received twice the pay of the ordinary legionary. There was not therefore so much difference in rank between a private and a captain as in our day. There were no aristocratic distinctions in the ancient world so marked as in the modern.
[Sidenote: The Roman camp.]
[Sidenote: The guardianship of the camp.]
[Sidenote: The breaking up of the camp.]
Our notice of the Roman legion would be incomplete without allusion to the camp in which the soldier virtually lived. A Roman army never halted for a single night without forming a regular intrenchment capable of holding all the fighting men, the beasts of burden, and the baggage. When the army could not retire, during the winter months, into some city, it was compelled to live in the camp. It was arranged and fortified according to a uniform plan, so that every company and individual had a place assigned. We cannot tell when this practice of intrenchment began; it was matured gradually, like all other things pertaining to the art of war. The system was probably brought to perfection during the wars with Hannibal. Skill in the choice of ground, giving facilities for attack and defense, and for procuring water and other necessities, was of great account with the generals. An area of about five thousand square feet was allowed for a company of infantry, and ten thousand feet for a troop of thirty dragoons. The form of a camp was an exact square, the length of each side being two thousand and seventeen feet. There was a space between the ramparts and the tents of two hundred feet to facilitate the marching in and out of soldiers, and to guard the cattle and booty. The principal street was one hundred feet wide, and was called Principia. The defenses of the camp consisted of a ditch, the earth from which was thrown inwards, and strong palisades of wooden stakes upon the top of the earthwork so formed. The ditch was sometimes fifteen feet deep, and the vallum or rampart ten feet in height. When the army encamped for the first time the tribunes administered an oath to each individual, including slaves, to the effect that they would steal nothing out of the camp. Every morning at daybreak, the centurions and the equites presented themselves before the tents of the tribunes, and the tribunes in like manner presented themselves to the praetorian, to learn the orders of the consuls, which through the centurions were communicated to the soldiers. Four companies took charge of the principal street, to see that it was properly cleaned and watered. One company took charge of the tent of the tribune, a strong guard attended to the horses, and another of fifty men stood beside the tent of the general that he might be protected from open danger and secret treachery. The velites mounted guard the whole night and day along the whole extent of the vallum, and each gate was guarded by ten men. The equites were intrusted with the duty of acting as sentinels during the night, and most ingenious measures were adopted to secure their watchfulness and fidelity. The watchword for the night was given by the commander-in-chief. "On the first signal being given by the trumpet, the tents were all struck and the baggage packed. At the second signal, the baggage was placed upon the beasts of burden; and at the third the whole army began to move. Then the herald, standing at the right hand of the general, demands thrice if they are ready for war, to which they all respond with loud and repeated cheers that they are ready, and for the most part, being filled with martial ardor, anticipate the question, 'and raise their right hands on high with a shout.'" [Footnote: Smith, Dict. of Ant., art. Castra.]
[Sidenote: Line of March.]
Josephus gives an account of the line of march in which the army of Vespasian entered Galilee. "1. The light-armed auxiliaries and bowmen, advancing to reconnoiter. 2. A detachment of Roman heavy-armed troops, horse and foot. 3. Ten men out of every century or company, carrying their own equipments and the measures of the camp. 4. The baggage of Vespasian and his legati guarded by a strong body of horse. 5. Vespasian himself, attended by his horse-guard and a body of spearmen. 6. The peculiar cavalry of the legion. 7. The artillery dragged by mules. 8. The legati, tribunes, and praefects of cohorts, guarded by a body of picked soldiers. 9. The standards, surrounding the eagle. 10. The trumpeters. 11. The main body of the infantry, six abreast, accompanied by a centurion, whose duty it was to see that the men kept their ranks. 12. The whole body of slaves attached to each legion, driving the mules and beasts of burden loaded with the baggage. 13.