Thus Xerxes and his hosts, in continuing their march to the southward, must necessarily traverse Thessaly, and in doing so they would have two narrow and dangerous defiles to pass—one at Mount Olympus, to get into the country, and the other at Thermopylæ, to get out of it. It consequently became a point of great importance to the Greeks to determine at which of these two passes they should make their stand against the torrent which was coming down upon them.
Messengers from Thessaly.
Negotiations.
This question would, of course, depend very much upon the disposition of Thessaly herself. The government of that country, understanding the critical situation in which they were placed, had not waited for the Athenians and Spartans to send embassadors to them, but, at a very early period of the war—before, in fact, Xerxes had yet crossed the Hellespont, had sent messengers to Athens to concert some plan of action. These messengers were to say to the Athenians that the government of Thessaly were expecting every day to receive a summons from Xerxes, and that they must speedily decide what they were to do; that they themselves were very unwilling to submit to him, but they could not undertake to make a stand against his immense host alone; that the southern Greeks might include Thessaly in their plan of defense, or exclude it, just as they thought best. If they decided to include it, then they must make a stand at the Olympic Straits, that is, at the pass between Olympus and Ossa; and to do that, it would be necessary to send a strong force immediately to take possession of the pass. If, on the contrary, they decided not to defend Thessaly, then the pass of Thermopylæ would be the point at which they must make their stand, and in that case Thessaly must be at liberty to submit on the first Persian summons.
Decision to defend the Olympic Straits.
Sailing of the fleet.
The Greeks, after consultation on the subject, decided that it would be best for them to defend Thessaly, and to take their stand, accordingly, at the Straits of Olympus. They immediately put a large force on board their fleet, armed and equipped for the expedition. This was at the time when Xerxes was just about crossing the Hellespont. The fleet sailed from the port of Athens, passed up through the narrow strait called Euripus, lying between the island of Eubœa and the main land, and finally landed at a favorable point of disembarkation, south of Thessaly. From this point the forces marched to the northward until they reached the Peneus, and then established themselves at the narrowest part of the passage between the mountains, strengthened their position there as much as possible, and awaited the coming of the enemy. The amount of the force was ten thousand men.
Advice of the King of Macedon.
They had not been here many days before a messenger came to them from the King of Macedon, which country, it will be seen, lies immediately north of Thessaly, earnestly dissuading them from attempting to make a stand at the Vale of Tempe. Xerxes was coming on, he said, with an immense and overwhelming force, one against which it would be utterly impossible for them to make good their defense at such a point as that. It would be far better for them to fall back to Thermopylæ, which, being a narrower and more rugged pass, could be more easily defended.
Besides this, the messenger said that it was possible for Xerxes to enter Thessaly without going through the Vale of Tempe at all. The country between Thessaly and Macedon was mountainous, but it was not impassable, and Xerxes would very probably come by that way. The only security, therefore, for the Greeks, would be to fall back and intrench themselves at Thermopylæ. Nor was there any time to be lost. Xerxes was crossing the Hellespont, and the whole country was full of excitement and terror.
The Greeks fall back to Thermopylæ.