But by far the most important measure which marked the nomination of the new generals, was, the enlargement of the line of fortifications at Syracuse. They constructed a new wall, inclosing an additional space and covering both their inner and their outer city to the westward, reaching from the outer sea to the Great Harbor, across the whole space fronting the rising slope of the hill of Epipolæ, and stretching far enough westward to inclose the sacred precinct of Apollo Temenites. This was intended as a precaution, in order that if Nikias, resuming operations in the spring, should beat them in the field and confine them to their walls, he might, nevertheless, be prevented from carrying a wall of circumvallation from sea to sea without covering a great additional extent of ground.[341] Besides this, the Syracusans fitted up and garrisoned the deserted town of Megara, on the coast to the north of Syracuse; they established a regular fortification and garrison in the Olympieion or temple of Zeus Olympius, which they had already garrisoned after the recent battle with Nikias; and they planted stakes in the sea to obstruct the convenient landing-places. All these precautions were useful to them; and we may even say that the new outlying fortification, inclosing the Temenites, proved their salvation in the coming siege, by so lengthening the circumvallation necessary for the Athenians to construct, that Gylippus had time to arrive before it was finished. But there was one farther precaution which the Syracusans omitted at this moment, when it was open to them without any hindrance, to occupy and fortify the Euryâlus, or the summit of the hill of Epipolæ. Had they done this now, probably the Athenians could never have made progress with their lines of circumvallation: but they did not think of it until too late, as we shall presently see. [341] Thucyd. vi, 75. Ἐτείχιζον δὲ οἱ Συρακόσιοι ἐν τῷ χειμῶνι πρός τε τῇ πόλει, τὸν Τεμενίτην ἐντὸς ποιησάμενοι, ~τεῖχος παρὰ πᾶν τὸ πρὸς τὰς Ἐπιπολὰς~ ὁρῶν, ~ὅπως μὴ δι’ ἐλάσσονος εὐαποτείχιστοι ὦσιν~, ἢν ἄρα σφάλλωνται, etc. I reserve the general explanation of the topography of Syracuse for the next chapter, when the siege begins.