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 Chap, xxxviii] OF THE ROMAN EMPIRE 173 an oath, to draw his sword in the cause of his country, till he had discharged the sacred duty by a military service of ten years. This wise institution continually poured into the field the rising generations of freemen and soldiers ; and their numbers were reinforced by the warlike and populous states of Italy, who, after a brave resistance, had yielded to the valour, and embraced the alliance, of the Eomans. The sage historian, who excited the virtue of the younger Scipio and beheld the ruin of Carthage, 4 has accurately described their military system ; their levies, arms, exercises, subordination, marches, encampments ; and the in- vincible legion, superior in active strength to the Macedonian phalanx of Philip and Alexander. From these institutions of peace and war, Polybius has deduced the spirit and success of a people incapable of fear and impatient of repose. The ambitious design of conquest, which might have been defeated by the seasonable conspiracy of mankind, was attempted and achieved ; and the perpetual violation of justice was maintained by the political virtues of prudence and courage. The arms of the republic, sometimes vanquished in battle, always victorious in war, advanced with rapid steps to the Euphrates, the Danube, the Rhine, and the Ocean ; and the images of gold, or silver, or brass, that might serve to represent the nations and their kings, were successively broken by the iron monarchy of Rome. 5 The rise of a city, which swelled into an Empire, may de- serve, as a singular prodigy, the reflection of a philosophic mind. But the decline of Borne was the natural and inevitable effect of immoderate greatness. Prosperity ripened the principle of decay ; the causes of destruction multiplied with the extent of conquest ; and, as soon as time or accident had removed the artificial supports, the stupendous fabric yielded to the pressure 4 While Carthage was in flames, Scipio repeated two lines of the Iliad, which express the destruction of Troy, acknowledging to Polybius, his friend and preceptor (Polyb. in Excerpt, de Virtut. et Vit. torn. ii. p. 1455-1465 [xxxix. 3]), that, while he recollected the vicissitudes of human affairs, he inwardly applied them to the future calamities of Rome (Appian. in Libycis, p. 136, edit. Toll. [Punica, c. 82]). 5 See Daniel, ii. 31-40. " And the fourth kingdom shall be strong as iron ; forasmuch as iron breaketh in pieces, and subdueth all things." The remainder of the prophecy (the mixture of iron and clay) was accomplished, according to St. Jerom, in his own time. Sicut enim in principio nihil Romano Imperio fortius et durius, ita in fine rerum nihil imbecillius : quum et in bellis civilibus et adversus diversas nationes aliarum gentium barbararum auxilio indigemus (Opera, torn. v. p. 572).