The Persian army remained as if in indecision for some days close to the scene of this sea fight, and then began to retreat to Thessaly, where it was proposed to winter and resume the campaign. But Xerxes, like Darius I before him, had conceived a disgust for European campaigns. He was afraid of the destruction of the bridge of boats. With part of the army he went on to the Hellespont, leaving the main force in Thessaly under a general, Mardonius. Of his own retreat the historian relates: “Whithersoever they came on the march and to whatever nation they seized the crops of that people and used them for provisions; and if they found no crops, then they took the grass which was growing up from the earth, and stripped off the bark from the trees and plucked down the leaves and devoured them; alike of the cultivated trees and of those growing wild; and they left nothing behind them: thus they did by reason of famine. Then plague too seized upon the army and dysentery, which destroyed them by the way, and some of them also who were sick the king left behind, laying charge upon the cities where at the time he chanced to be in his march, to take care of them and support them; of these he left some in Thessaly, and some at Siris in Paionia, and some in Macedonia.... When, passing on from Thrace they came to the passage, they crossed over the Hellespont in haste to Abydos by means of the ships, for they did not find the floating bridges still stretched across, but broken up by a storm. While staying there for a time they had distributed to them an allowance of food more abundant than they had had by the way, and from satisfying their hunger without restraint and also from the changes of water there died many of those in the army who had remained safe till then. The rest arrived with Xerxes at Sardis.” § 10 The rest of the Persian army remained in Thessaly under the command of Mardonius, and for a year he maintained an aggressive campaign against the Greeks. Finally, he was defeated and killed in a pitched battle at Platæa (479 B.C.), and on the same day the Persian fleet and a land army met with joint disaster under the shadow of Mount Mycale on the Asiatic mainland, between Ephesus and Miletus. The Persian ships, being in fear of the Greeks, had been drawn up on shore and a wall built about them; but the Greeks disembarked and stormed this enclosure. They then sailed to the Hellespont to destroy what was left of the bridge of boats, so that later the Persian fugitives, retreating from Platæa, had to cross by shipping at the Bosphorus, and did so with difficulty. Encouraged by these disasters of the imperial power, the Ionian cities in Asia began for a second time to revolt against the Persians.