The cavalry, without which the force of the legion would have remained imperfect, was divided into ten troops or squadrons; the first, as the companion of the first cohort, consisted of a hundred and thirty-two men; whilst each of the other nine amounted only to sixty-six. The entire establishment formed a regiment, if we may use the modern expression, of seven hundred and twenty-six horse, naturally connected with its respective legion, but occasionally separated to act in the line, and to compose a part of the wings of the army[56] the cavalry of the emperors was no longer composed, like that of the ancient republic, of the noblest youths of Rome and Italy, who, by performing their military service on horseback, prepared themselves for the offices of senator and consul; and solicited, by deeds of valor, the future suffrages of their countrymen[57] since the alteration of manners and government, the most wealthy of the equestrian order were engaged in the administration of justice, and of the revenue;[58] and whenever they embraced the profession of arms, they were immediately intrusted with a troop of horse, or a cohort of foot[59] trajan and hadrian formed their cavalry from the same provinces, and the same class of their subjects, which recruited the ranks of the legion. The horses were bred, for the most part, in Spain or Cappadocia. The Roman troopers despised the complete armor with which the cavalry of the East was encumbered. Their more useful arms consisted in a helmet, an oblong shield, light boots, and a coat of mail. A javelin, and a long broad sword, were their principal weapons of offence. The use of lances and of iron maces they seem to have borrowed from the barbarians.[60]
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[61] 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[62] 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[63] 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[64] 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.[65]
Part III
The camp of a Roman legion presented the appearance of a fortified city[66] 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 whom the use of the spade and the pickaxe was no less familiar than that of the sword or pilum. Active valor may often be the present of nature; but such patient diligence can be the fruit only of habit and discipline[67]
Whenever the trumpet gave the signal of departure, the camp was almost instantly broke up, and the troops fell into their ranks without delay or confusion. Besides their arms, which the legendaries scarcely considered as an encumbrance, they were laden with their kitchen furniture, the instruments of fortification, and the provision of many days[68] under this weight, which would oppress the delicacy of a modern soldier, they were trained by a regular step to advance, in about six hours, near twenty miles.[69] On the appearance of an enemy, they threw aside their baggage, and by easy and rapid evolutions converted the column of march into an order of battle.[70] The slingers and archers skirmished in the front; the auxiliaries formed the first line, and were seconded or sustained by the strength of the legions; the cavalry covered the flanks, and the military engines were placed in the rear.
Such were the arts of war, by which the Roman emperors defended their extensive conquests, and preserved a military spirit, at a time when every other virtue was oppressed by luxury and despotism. If, in the consideration of their armies, we pass from their discipline to their numbers, we shall not find it easy to define them with any tolerable accuracy. We may compute, however, that the legion, which was itself a body of six thousand eight hundred and thirty-one Romans, might, with its attendant auxiliaries, amount to about twelve thousand five hundred men. The peace establishment of Hadrian and his successors was composed of no less than thirty of these formidable brigades; and most probably formed a standing force of three hundred and seventy-five thousand men. Instead of being confined within the walls of fortified cities, which the Romans considered as the refuge of weakness or pusillanimity, the legions were encamped on the banks of the great rivers, and along the frontiers of the barbarians. As their stations, for the most part, remained fixed and permanent, we may venture to describe the distribution of the troops. Three legions were sufficient for Britain. The principal strength lay upon the Rhine and Danube, and consisted of sixteen legions, in the following proportions: two in the Lower, and three in the Upper Germany; one in Rhaetia, one in Noricum, four in Pannonia, three in Maesia, and two in Dacia. The defence of the Euphrates was intrusted to eight legions, six of whom were planted in Syria, and the other two in Cappadocia. With regard to Egypt, Africa, and Spain, as they were far removed from any important scene of war, a single legion maintained the domestic tranquillity of each of those great provinces. Even Italy was not left destitute of a military force. Above twenty thousand chosen soldiers, distinguished by the titles of City Cohorts and Praetorian Guards, watched over the safety of the monarch and the capital. As the authors of almost every revolution that distracted the empire, the Praetorians will, very soon, and very loudly, demand our attention; but, in their arms and institutions, we cannot find any circumstance which discriminated them from the legions, unless it were a more splendid appearance, and a less rigid discipline.[71]
56
Veget. de Re Militari, l. ii. c. 6. His positive testimony, which might be supported by circumstantial evidence, ought surely to silence those critics who refuse the Imperial legion its proper body of cavalry. Note: See also Joseph. B. J. iii. vi. 2.-M.
58
Plin. Hist. Natur. xxxiii. 2. The true sense of that very curious passage was first discovered and illustrated by M. de Beaufort, Republique Romaine, l. ii. c. 2.
59
As in the instance of Horace and Agricola. This appears to have been a defect in the Roman discipline; which Hadrian endeavored to remedy by ascertaining the legal age of a tribune. * Note: These details are not altogether accurate. Although, in the latter days of the republic, and under the first emperors, the young Roman nobles obtained the command of a squadron or a cohort with greater facility than in the former times, they never obtained it without passing through a tolerably long military service. Usually they served first in the praetorian cohort, which was intrusted with the guard of the generaclass="underline" they were received into the companionship (contubernium) of some superior officer, and were there formed for duty. Thus Julius Caesar, though sprung from a great family, served first as contubernalis under the praetor, M. Thermus, and later under Servilius the Isaurian. (Suet. Jul. 2, 5. Plut. in Par. p. 516. Ed. Froben.) The example of Horace, which Gibbon adduces to prove that young knights were made tribunes immediately on entering the service, proves nothing. In the first place, Horace was not a knight; he was the son of a freedman of Venusia, in Apulia, who exercised the humble office of coactor exauctionum, (collector of payments at auctions.) (Sat. i. vi. 45, or 86.) Moreover, when the poet was made tribune, Brutus, whose army was nearly entirely composed of Orientals, gave this title to all the Romans of consideration who joined him. The emperors were still less difficult in their choice; the number of tribunes was augmented; the title and honors were conferred on persons whom they wished to attack to the court. Augustus conferred on the sons of senators, sometimes the tribunate, sometimes the command of a squadron. Claudius gave to the knights who entered into the service, first the command of a cohort of auxiliaries, later that of a squadron, and at length, for the first time, the tribunate. (Suet in Claud. with the notes of Ernesti.) The abuses that arose caused by the edict of Hadrian, which fixed the age at which that honor could be attained. (Spart. in Had. &c.) This edict was subsequently obeyed; for the emperor Valerian, in a letter addressed to Mulvius Gallinnus, praetorian praefect, excuses himself for having violated it in favor of the young Probus afterwards emperor, on whom he had conferred the tribunate at an earlier age on account of his rare talents. (Vopisc. in Prob. iv.)-W. and G. Agricola, though already invested with the title of tribune, was contubernalis in Britain with Suetonius Paulinus. Tac. Agr. v.-M.
62
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.)
63
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.
65
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.
66
Vegetius finishes his second book, and the description of the legion, with the following emphatic words:-"Universa quae in quoque belli genere necessaria esse creduntur, secum legio debet ubique portare, ut in quovis loco fixerit castra, armatam faciat civitatem."
67
For the Roman Castrametation, see Polybius, l. vi. with Lipsius de Militia Romana, Joseph. de Bell. Jud. l. iii. c. 5. Vegetius, i. 21–25, iii. 9, and Memoires de Guichard, tom. i. c. 1.
70
See those evolutions admirably well explained by M. Guichard Nouveaux Memoires, tom. i. p. 141–234.
71
Tacitus (Annal. iv. 5) has given us a state of the legions under Tiberius; and Dion Cassius (l. lv. p. 794) under Alexander Severus. I have endeavored to fix on the proper medium between these two periods. See likewise Lipsius de Magnitudine Romana, l. i. c. 4, 5.