But his fleet was not destined to reach the point of communication with the same ease as he had arrived before Thermopylæ. After having ascertained by the ten ships already mentioned, which captured the three Grecian guardships, that the channel between Skiathos and the mainland was safe, the Persian admiral Megabates sailed with his whole fleet from Therma, or from Pydna,[155] his station in the Thermaic gulf, eleven days after the monarch had begun his land-march; and reached in one long day’s sail the eastern coast of Magnesia, not far from its southernmost promontory. The greater part of this line of coast, formed by the declivities of Ossa and Pelion, is thoroughly rocky and inhospitable: but south of the town called Kasthanæa there was a short extent of open beach, where the fleet rested for the night before coming to the line of coast called the Sêpias Aktê.[156] The first line of ships were moored to the land, but the larger number of this immense fleet swung at anchor in a depth of eight lines. In this condition they were overtaken the next morning by a sudden and desperate hurricane,—a wind called by the people of the country Hellespontias, which blew right upon the shore. The most active among the mariners found means to forestall the danger by beaching and hauling their vessels ashore; but a large number, unable to take such a precaution, were carried before the wind and dashed to pieces near Melibœa, Kasthanæa, and other points of this unfriendly region. Four hundred ships of war, according to the lowest estimate, together with a countless heap of transports and provision craft, were destroyed: and the loss of life as well as property was immense. For three entire days did the terrors of the storm last, during which time the crews ashore, left almost without defence, and apprehensive that the inhabitants of the country might assail or plunder them, were forced to break up the ships driven ashore in order to make a palisade out of the timbers.[157] Though the Magian priests who accompanied the armament were fervent in prayer and sacrifice,—not merely to the Winds, but also to Thetis and the Nereids, the tutelary divinities of Sêpias Aktê,—they could obtain no mitigation until the fourth day:[158] thus long did the prayers of Delphi and Athens, and the jealousy of the gods against superhuman arrogance, protract the terrible visitation. At length, on the fourth day, calm weather returned, when all those ships which were in condition to proceed, put to sea and sailed along the land, round the southern promontory of Magnesia, to Aphetæ, at the entrance of the gulf of Pagasæ. Little, indeed, had Xerxes gained by the laborious cutting through mount Athos, in hopes to escape the unseen atmospheric enemies which howl around that formidable promontory: the work of destruction to his fleet was only transferred to the opposite side of the intervening Thracian sea. [155] Diodor. xi, 12.