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148 It was now decided to make the first stand at the narrow pass of Thermopylæ (Hotwells-Gate), the key of Greece itself. The river Spercheius has since established a tract of alluvial deposit between the mountain and the sea, but the hot springs are still there, in pools of clear water, and the other features of the scene remain much as they were in the time of Herodotus. The pass leads along the shore from Thessaly to Locris. The Grecian fleet were to support the army in the narrow strait by Artemisium, on the head of Eubœa (Negropont). As the Persian host rolled on, it had increased like a snowball, imbibing the contingents of all the districts that submitted. But the elements were still against the invaders. A storm arose when their fleet was off Magnesia, attributed by the Athenians to the intervention of Boreas (the North Wind), who had married a daughter of their mythical king Erechtheus. At least four hundred galleys perished, and so much wealth was cast ashore that the wreckers on the coast became rich men; and the Persians soon after lost fifteen ships more, which mistook the enemy's fleet for their own. Xerxes was himself with the land-force, which had now occupied the territory of Trachis, north of the pass of Thermopylæ. The little Greek army had posted itself behind an ancient wall, which barred the pass, and which they had repaired, at a spot where there was only room for a single chariot-road. The nucleus of the force (in all under 8000 of all arms) was three hundred thorough-bred Spartans, each attended by his seven Helots. They were all fathers of families, who had left sons at home to succeed them. At their head was Leonidas, now senior king of Sparta. This