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Rh was called the Bay of Thapsus, while the southern one formed the great harbor of the city of Syracuse itself. A small island, or peninsula (for such it soon was rendered), lies at the south-eastern extremity of this knob of land, stretching almost entirely across the mouth of the great harbor, and rendering it nearly land-locked. This island comprised the original settlement of the first Greek colonists from Corinth, who founded Syracuse two thousand five hundred years ago; and the modern city has shrunk again into these primary limits. But, in the fifth century before our era, the growing wealth and population of the Syracusans had led them to occupy and include within their city walls portion after portion of the main land lying next to the little isle, so that at the time of the Athenian expedition the seaward part of the land between the two bays already spoken of was built over, and fortified from bay to bay, and constituted the larger part of Syracuse.

The landward wall, therefore, of this district of the city, traversed this knob of land, which continues to slope upward from the sea, and which, to the west of the old fortifications (that is toward the interior of Sicily), rises rapidly for a mile or two, but diminishes in width, and finally terminates in a long narrow ridge, between which and Mount Hybla a succession of chasms and uneven low ground extends. On each flank of this ridge the descent is steep and precipitous from its summits to the strips of level land that lie immediately below it, both to the southwest and northwest.

The usual mode of assailing fortified towns in the time of the Peloponnesian war was to build a double wall round them, sufficiently strong to check any sally of the garrison from within, or any attack of a relieving force from without. The interval within the two walls of the circumvallation was roofed over, and formed barracks, in which the besiegers posted themselves, and awaited the effects of want or treachery among the besieged in producing a surrender; and, in every Greek city of those days, as in every Italian republic of the Middle Ages, the rage of domestic sedition between aristocrats and democrats ran high. Rancorous refugees swarmed in the camp of every invading enemy; and every blockaded city was sure to contain within its walls a body of intriguing malcontents, who were eager to purchase a party triumph at the expense of a national disaster.