[Sidenote: Organization of the legion.]
[Sidenote: The Hastati.]
[Sidenote: The Principes and Velites.]
[Sidenote: The Triarii.]
[Sidenote: The Pilarii.]
[Sidenote: The Equites.]
The Roman legion, whether it was composed of four thousand men, as in the early ages of the republic or six thousand, as in the time of Augustus, of was divided into ten cohorts, and each cohort was composed of Hastati, Principes, Triarii, and Velites. The soldiers of the first line, called Hastati, consisted of youths in the bloom of manhood, and were distributed into fifteen companies or maniples. Each company contained sixty privates, two centurions, and a standard-bearer. Two thirds were heavily armed, and bore the long shield, the remainder carried only a spear and light javelins. The second line, the Principes, was composed of men in the full vigor of life, divided also into fifteen companies, all heavily armed, and distinguished by the splendor of their equipments. The third body, the Triarii, was also composed of tried veterans, in fifteen companies, the least trustworthy of which were placed in the rear. These formed three lines. The Velites were light- armed troops, employed on outpost duty, and mingled with the horsemen. The Hastati were so called because they were armed with the hasta; the Principes, for being placed so near to the front; the Triarii, from having been arrayed behind the first two lines as a body of reserve, armed with the pilum, thicker and stronger than the Grecian lance—four and a half feet long, of wood, with a barbed head of iron—so that the whole length of the weapon was six feet nine inches. It was used either to throw or thrust with, and when it pierced the enemy's shield, [Footnote: Liv. viii. 8.] the iron head was bent, and the spear, owing to the twist in the iron, still held to the shield. [Footnote: Plut. Mar. 25.] Each soldier carried two of these weapons. [Footnote: Polyb. vi. 23.] The Principes were in the front ranks of the phalanx, clad in complete defensive armor—men in the vigor of strength. The Pilarii were in the rear, who threw the heavy pilum over the heads of their comrades, in order to break the enemy's line. In the time of the empire, when the legion was modified, the infantry wore cuirasses and helmets, and two swords; namely, a long one and a dagger. The select infantry carried a long spear and a shield, the rest a pilum. Each man carried a saw, a basket, a mattock, a hatchet, a leather strap, a hook, a chain, and provisions for three days. The Equites wore helmets and cuirasses, like the infantry, with a broad sword at the right side, and in their hand a long pole. A buckler swung at the horse's flank. They were also furnished with a quiver containing three or four javelins.
[Sidenote: The artillery.]
[Sidenote: The Testudo.]
[Sidenote: The Helepolis.]
[Sidenote: The Turris.]
[Sidenote: Scailing-ladders.]
The artillery were used both for hurling missiles in battle, and for the attack of fortresses. The tormentum, which was an elastic instrument, discharged stones and darts, and was continued until the discovery of gunpowder. In besieging a city, the ram was employed for destroying the lower part of a wall, and the balista, which discharged stones, was used to overthrow the battlements. The balista would project a stone weighing from fifty to three hundred pounds. The aries, or battering-ram, consisted of a large beam made of the trunk of a tree, frequently one hundred feet in length, to one end of which was fastened a mace of iron or bronze, which resembled in form the head of a ram, and was often suspended by ropes from a beam fixed transversely over it, so that the soldiers were relieved from supporting its weight, and were able to give it a rapid and forcible motion backward and forward. And when this machine was further aided by placing a frame in which it was suspended upon wheels, and constructing over it a roof, so as to form a testudo, which protected the besieging party from the assaults of the besieged, there was no tower so strong, no wall so thick, as to resist a long-continued attack. Its great length enabled the soldiers to work across the ditch, and as many as one hundred men were often employed upon it. The Romans learned from the Greeks the art of building this formidable engine, which was used with great effect by Alexander, but with still greater by Vespasian in the siege of Jerusalem. It was first used by the Romans in the siege of Syracuse. The vinea was a sort of roof under which the soldiers protected themselves when they undermined walls. The helepolis, also used in the attack of cities, was a square tower furnished with all the means of assault. This also was a Greek invention, and that used by Demetrius at the siege of Rhodes, B.C. 306, was one hundred and thirty-five feet high and sixty- eight wide, divided into nine stories. Towers of this description were used at the siege of Jerusalem, [Footnote: Josephus B. J., ii. 19.] and were manned by two hundred men employed upon the catapults and rams. The turris, a tower of the same class, was used both by Greeks and Romans, and even by Asiatics. Mithridates used one at the siege of Cyzicus one hundred and fifty feet in height. This most formidable engine was generally made of beams of wood covered on three sides with iron and sometimes with raw hides. They were higher than the walls and all the other fortifications of a besieged place, divided into stories pierced with windows. In and upon them were stationed archers and slingers, and in the lower story was a battering-ram. They also carried scaling-ladders, so that when the wall was cleared, these were placed against the walls. They were placed upon wheels, and brought as near the walls as possible. It was impossible to resist these powerful engines, unless they were burned, or the ground undermined upon which they stood, except by overturning them with stones or iron-shod beams hung from a mast on the wall, or by increasing the height of the wall, or the erection of temporary towers on the wall beside them.
[Sidenote: The advantages of defenders.]
[Sidenote: Ordinary way of capture.]
[Sidenote: Strength and advantage of fortresses.]
Thus there was no ancient fortification capable of withstanding a long siege when the besieged city was, short of defenders or provisions. With equal forces an attack was generally a failure, for the defenders had always a great advantage. But when the number of defenders was reduced, or when famine pressed, the skill and courage of the assailants would ultimately triumph. Some ancient cities made a most obstinate resistance, like Tarentum; Carthage, which stood a siege of four years; Numantia in Spain, and Jerusalem. When cities were of immense size, population, and resources, like Rome when besieged by Alaric, it was easier to take them by cutting off all ingress and egress, so as to produce famine. Tyre was only taken by Alexander by cutting off the harbor. Babylon could not have been taken by Cyrus by assault, since the walls were three hundred and thirty-seven feet high, according to Herodotus, and the ditch too wide for the use of battering-rams. He resorted to an expedient of which the blinded inhabitants of that doomed city never dreamed, which rendered their impregnable fortifications useless. Nor would the Romans have probably prevailed against Jerusalem had not famine decimated and weakened the people. Fortified cities, though scarcely ever impregnable, were yet more in use in ancient than modern times, and greatly delayed the operations of advancing armies. And it was probably the fortified camp of the Romans, which protected an army against surprises and other misfortunes, which gave such efficacy to the legions.
[Sidenote: The Tribunes.]
[Sidenote: The Centurions.]
[Sidenote: Gradation of ranks.]
The chief officers of the legion were the tribunes, and originally there was one in each legion from the three tribes—the Ramnes, Luceres, and Tities. In the time of Polybius the number in each legion was six. Their authority extended equally over the whole legion; but, to prevent confusion, it was the custom for these military tribunes to divide themselves into three sections of two, and each pair undertook the routine duties for two months out of six. They nominated the centurions, and assigned to each the company to which he belonged. These tribunes, at first, were chosen by the commander-in-chief—by the kings and consuls; but during the palmy days of the republic, when the patrician power was preeminent, they were elected by the people, that is, the citizens. Later they were named half by the Senate and half by the consuls. No one was eligible to this great office who had not served ten years in the infantry or five in the cavalry. They were distinguished