431. Commencement of the great Peloponnesian war, in which Sparta, at the head of nearly all the Peloponnesian states, and aided by the Boeotians and some of the other Greeks beyond the Isthmus, endeavours to reduce the power of Athens, and to restore independence to the Greek maritime states who were the subject allies of Athens. At the commencement of the war the Peloponnesian armies repeatedly invade and ravage Attica, but Athens herself is impregnable, and her fleets secure her the dominion of the sea. 430. Athens visited by a pestilence, which sweeps off large numbers of her population. 426. The Athenians gain great advantages over the Spartans at Sphacteria, and by occupying Cythera; but they suffer a severe defeat in Boeotia, and the Spartan general Brasidas, leads an expedition to the Thracian coasts, and conquers many of the most valuable Athenian possessions in those regions. 421. Nominal truce for thirty years between Athens and Sparta, but hostilities continue on the Thracian coast and in other quarters. 415. The Athenians send an expedition to conquer Sicily. CHAPTER II. -- DEFEAT OF THE ATHENIANS AT SYRACUSE, B.C.413. "The Romans knew not, and could not know, how deeply the greatness of their own posterity, and the fate of the whole Western world, were involved in the destruction of the fleet of Athens in the harbour of Syracuse. Had that great expedition proved victorious, the energies of Greece during the next eventful century would have found their field in the West no less than in the East; Greece, and not Rome, might have conquered Carthage; Greek instead of Latin might have been at this day the principal element of the language of Spain, of France, and of Italy; and the laws of Athens, rather than of Rome, might be the foundation of the law of the civilized world."--ARNOLD. "The great expedition to Sicily, one of the most decisive events in the history of the world."--NIEBUHR. Few cities have undergone more memorable sieges during ancient and mediaeval times, than has the city of Syracuse. Athenian, Carthaginian, Roman, Vandal, Byzantine, Saracen, and Norman, have in turns beleaguered her walls; and the resistance which she successfully opposed to some of her early assailants was of the deepest importance, not only to the fortunes of the generations then in being, but to all the subsequent current of human events. To adopt the eloquent expressions of Arnold respecting the check which she gave to the Carthaginian arms, "Syracuse was a breakwater, which God's providence raised up to protect the yet immature strength of Rome." And her triumphant repulse of the great Athenian expedition against her was of even more wide-spread and enduring importance. It forms a decisive epoch in the strife for universal empire, in which all the great states of antiquity successively engaged and failed.