With the capture of Syracuse, all Sicily, it was hoped, would be secured. Carthage and Italy were next to be attacked. With large levies of Iberian mercenaries she then meant to overwhelm her Peloponnesian enemies. The Persian monarchy lay in hopeless imbecility, inviting Greek invasion; nor did the known world contain the power that seemed capable of checking the growing might of Athens, if Syracuse once should be hers. The national historian of Rome has left us an episode of his great work, a disquisition on the probable effects that would have followed if Alexander the Great had invaded Italy. Posterity has generally regarded that disquisition as proving Livy's patriotism more strongly than his impartiality or acuteness. Yet, right or wrong, the speculations of the Roman writer were directed to the consideration of a very remote possibility. To whatever age Alexander's life might have been prolonged, the East would have furnished full occupation for his martial ambition, as well as for those schemes of commercial grandeur and imperial amalgamation of nations in which the truly great qualities of his mind loved to display themselves. With his death the dismemberment of his empire among his generals was certain, even as the dismemberment of Napoleon's empire among his marshals would certainly have ensued if he had been cut off in the zenith of his power. Rome, also, was far weaker when the Athenians were in Sicily than she was a century afterward in Alexander's time. There can be little doubt but that Rome would have been blotted out from the independent powers of the West, had she been attacked at the end of the fifth century B.C. by an Athenian army, largely aided by Spanish mercenaries, and flushed with triumphs over Sicily and Africa, instead of the collision between her and Greece having been deferred until the latter had sunk into decrepitude, and the Roman Mars had grown into full vigor. The armament which the Athenians equipped against Syracuse was in every way worthy of the state which formed such projects of universal empire, and it has been truly termed "the noblest that ever yet had been sent forth by a free and civilized commonwealth." The fleet consisted of one hundred and thirty-four war-galleys, with a multitude of storeships. A powerful force of the best heavy-armed infantry that Athens and her allies could furnish was sent on board it, together with a smaller number of slingers and bowmen. The quality of the forces was even more remarkable than the number. The zeal of individuals vied with that of the republic in giving every galley the best possible crew and every troop the most perfect accoutrements. And with private as well as public wealth eagerly lavished on all that could give splendor as well as efficiency to the expedition, the fated fleet began its voyage for the Sicilian shores in the summer of 415.