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and 1,800 cavalry. The former were in twenty cohorts (see cohors), each consisting of 420 men. Ten of these cohorts fought on the right wing, aud ten on the left wing of the legions. Besides these, four cohorts of 400 men each were formed into a picked body. The cavalry were in six squadrons (see ala, 1) of 300 men each. Four of these belonged to the main army, and two to the picked body. In wars beyond the limits of Italy there were also auxiliary forces (auxllia), consisting either of soldiers raised in the country where the war was being carried on, or of light-armed troops furnished by allied kings and nations. Besides the ordinary component parts of the legion there was also the bodyguard of the commander-in-chief, the cfihors prcvtoria. (See cohors.)
In the course of the 1st century b.c. the organization of the legion was essentially altered. In the first place, in the time of Marius, the census ceased to be the basis of the levy, and all the citizens collectively were placed on the same footing in respect io their military service aud the uniform which they wore. All the soldiers of the legion alike received the heavy equipment and the pilum, while the light-armed velites were done away with. After the right of citizenship had been conferred on the Italian allies, these no longer formed a separate part of the legions, but were incorporated with them. Thus the Roman army now consisted only of heavy-armed legions and of light-armed auxiliary troops. The latter were partly raised in the provinces and divided into cohorts, and partly enlisted as slingers and archers. The cavalry of the legions ceased to exist. Like the light-armed soldiers, the whole of the cavalry consisted of auxiliary troops, who were partly enlisted and partly levied from the provinces, while some were supplied according to agreement by allied nations and princes. A further important novelty introduced by Marius was the use of the cohort-formation, instead of the maniple-formation, which broke up the front too much. The legion was now divided into ten cohorts, in each of which there were three maniples of hastati, principes, and triarii, designations which now only concern the relative rank of the six centurions of the cohort. The customary battle array was in three divisions, the first being formed of four cohorts, and the second and third of three each. Again, while in earlier times : the obligation of service extended at the
! most in the infantry to twenty campaigns and in the cavalry to ten, from the days of Marius the soldier remained uninterruptedly for twenty years with the army ; an earlier dismissal being only exceptional. For this reason the well-to-do classes sought to withdraw themselves from the general military service, and it thus came to pass that the legions were for the greater part manned by means of conscriptions from the lowest strata of the burgher population of Italy, in which the service was regarded simply as a means of livelihood. Thus from the original army of citizens there was gradually developed a standing army of mercenaries. Under the Empire we find what is really a standing army, bound to the emperor by oath (see sacramentdm) ; apart from the legions this army consisted of the auxilia (q.v.), the guards stationed in Rome and the neighbourhood (see pr.e-toriani), and the city-cohorts (see cohors), the artillery and the corps of workmen (sec fabri), the marines (see classiarii), and the municipal and provincial militia. The legions are now once more provided with a corps of cavalry 120 strong, and are designated not only by numbers, but also by distinctive names. Together with the auxiliary troops they form the garrison of the imperatorial provinces under the command of the imperatorial leg&ti legwnum (see legati), whose place was taken in the middle of the 3rd century by the proefe.cti legionum (see pr^fecti). The strength of the legion now amounted to 5-6,000 men, raised partly by a regular levy, partly by drawing recruits from the Roman citizens of all the provinces beyond the bounds of Italy. As under the Republic, it was divided into 10 cohorts of 6 centuries each; the first cohort was, however, twice the strength of the remainder. It was not until the second half of the 3rd century A.D. that a new division of the 10 cohorts into 55 centuries came inter use, with 10 centuries in the first cohort, and 5 in each of the rest. At the death of Augustus, the number of the legions was 25 ; it was then increased to 30, and this number was maintained until the end of the 2nd century, when three new legions were added by Septimius Severus. From the beginning of the 4th century it gradually rose to about 175, each of them, however, mustering a considerably smaller contingent. In course of time, and especially after the 2nd century, owing to the conflicts with the barbarians, the legion was drawn up more and more