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[Footnote 54: See Arrian's Tactics.]

The safety and honor of the empire was principally intrusted to the legions, but the policy of Rome condescended to adopt every useful instrument of war. Considerable levies were regularly made among the provincials, who had not yet deserved the honorable distinction of Romans. Many dependent princes and communities, dispersed round the frontiers, were permitted, for a while, to hold their freedom and security by the tenure of military service. ^55 Even select troops of hostile barbarians were frequently compelled or persuaded to consume their dangerous valor in remote climates, and for the benefit of the state. ^56 All these were included under the general name of auxiliaries; and howsoever they might vary according to the difference of times and circumstances, their numbers were seldom much inferior to those of the legions themselves. ^57 Among the auxiliaries, the bravest and most faithful bands were placed under the command of praefects and centurions, and severely trained in the arts of Roman discipline; but the far greater part retained those arms, to which the nature of their country, or their early habits of life, more peculiarly adapted them. By this institution, each legion, to whom a certain proportion of auxiliaries was allotted, contained within itself every species of lighter troops, and of missile weapons; and was capable of encountering every nation, with the advantages of its respective arms and discipline. ^58 Nor was the legion destitute of what, in modern language, would be styled a train of artillery. It consisted in ten military engines of the largest, and fifty-five of a smaller size; but all of which, either in an oblique or horizontal manner, discharged stones and darts with irresistible violence. ^59

[Footnote 55: Such, in particular, was the state of the Batavians. Tacit. Germania, c. 29.]

[Footnote 56: Marcus Antoninus obliged the vanquished Quadi and Marcomanni to supply him with a large body of troops, which he immediately sent into Britain. Dion Cassius, l. lxxi. (c. 16.)]

[Footnote 57: Tacit. Annal. iv. 5. Those who fix a regular proportion of as many foot, and twice as many horse, confound the auxiliaries of the emperors with the Italian allies of the republic.]

[Footnote 58: Vegetius, ii. 2. Arrian, in his order of march and battle against the Alani.]

[Footnote 59: The subject of the ancient machines is treated with great knowledge and ingenuity by the Chevalier Folard, (Polybe, tom. ii. p. 233- 290.) He prefers them in many respects to our modern cannon and mortars. We may observe, that the use of them in the field gradually became more prevalent, in proportion as personal valor and military skill declined with the Roman empire.

When men were no longer found, their place was supplied by machines. See Vegetius, ii. 25. Arrian.]

Chapter I: The Extent Of The Empire In The Age Of The Antonines.

Part III.

The camp of a Roman legion presented the appearance of a fortified city. ^60 As soon as the space was marked out, the pioneers carefully levelled the ground, and removed every impediment that might interrupt its perfect regularity. Its form was an exact quadrangle; and we may calculate, that a square of about seven hundred yards was sufficient for the encampment of twenty thousand Romans; though a similar number of our own troops would expose to the enemy a front of more than treble that extent. In the midst of the camp, the praetorium, or general's quarters, rose above the others; the cavalry, the infantry, and the auxiliaries occupied their respective stations; the streets were broad and perfectly straight, and a vacant space of two hundred feet was left on all sides between the tents and the rampart. The rampart itself was usually twelve feet high, armed with a line of strong and intricate palisades, and defended by a ditch of twelve feet in depth as well as in breadth. This important labor was performed by the hands of the legionaries themselves; to