to enable them to emerge from the affair with honour.  Sparta was not threatened with the same fate, but she was at that time the first military state in Greece, and the whole of the Peloponnesus acknowledged her sway; in the event of her recognising the suzerainty of the barbarians, the latter would not fail to require of her the renunciation of her hegemony, and she would then be reduced to the same rank as her former rivals, Tegea and Argos.  Athens and Sparta therefore united to repulse the common enemy, and the advantage that this alliance afforded them was so patent that none of the other states ventured to declare openly for the great king.  Argos and Crete, the boldest of them, announced that they would observe neutrality; the remainder, Thessalians, Boeotians, and people of Corcyra, gave their support to the national cause, but did so unwillingly.

Xerxes crossed the Hellespont in the spring of 480, by two bridges of boats thrown across it between Abydos and Sestos; he then formed his force into three columns, and made his way slowly along the coast, protected on the left by the whole of his fleet from any possible attack by the squadrons of the enemy.  The Greeks had three lines of defence which they could hold against him, the natural strength of which nearly compensated them for the inferiority of their forces; these were Mount Olympus, Mount OEta, and the isthmus of Corinth.  The first, however, was untenable, owing to the ill will of the Thessalians; as a precautionary measure 10,000 hoplites were encamped upon it, but they evacuated the position as soon as the enemy’s advance-guard came into sight.  The natural barrier of OEta, less formidable than that of Olympus, was flanked by the Euboean straits on the extreme right, but the range was of such extent that it did not require to be guarded with equal vigilance along its whole length.  The Spartans did not at first occupy it, for they intended to accumulate all the Greek forces, both troops and vessels, around the isthmus.  At that point the neck of land was so narrow, and the sea so shut in, that the numbers of the invading force proved a drawback to them, and the advantage almost of necessity lay with that of the two adversaries who should be best armed and best officered.  This plan of the Spartans was a wise one, but Athens, which was thereby sacrificed to the general good, refused to adopt it, and as she alone furnished almost half the total number of vessels, her decision had to be deferred to.  A body of about 10,000 hoplites was therefore posted in the pass of Thermopylae under the command of Leonidas, while a squadron of 271 vessels disposed themselves near the promontory of Artemision, off the Euripus, and protected the right flank of the pass against a diversion from the fleet.  Meanwhile Xerxes had been reinforced in the course of his march by the contingents from Macedonia, and had received the homage of the cities of Thessaly; having reached the defiles of the OEta and the Euboea, he began by attacking the