=97.= The youth and ill success of Mardonius led Darius to recall him, and place the command of his new expedition against the Greeks in the hands of Datis, a Mede, and Artaphernes, his own nephew. In the spring of 490 B. C., the great host was drawn up off the coast of Cilicia—a fleet of 600 triremes, carrying not less than 100,000 men. They sailed westward and ravaged the isle of Naxos, but spared Delos, the reputed birth-place of Apollo and Artemis, because the Median Datis recognized them as identical with his own national divinities, the sun and moon. The fleet then advanced to Eubœa, Eretria being the first object of vengeance. Carystus, refusing to join the armament against her neighbors, was taken and destroyed. Eretria withstood a siege of six days; but the unhappy city was a prey to the same dissensions which constituted the fatal weakness of Greece.[44] Two traitors of the oligarchical party opened the gates to the barbarians. The place was given up to plunder, the temples burnt, and the people enslaved. =98.= A swift-footed messenger was now dispatched from Athens to Sparta imploring aid. The distance was ninety miles, and he reached his destination the day after his departure. The Spartans did not refuse their assistance, but they declared that religion forbade their marching before the full moon, and it was now only the ninth day. The Persians were already landed on the coast of Attica, and, guided by Hippias, advanced to the plain of Marathon. The Athenian army, posted upon the heights, had to consider whether to await their tardy allies or meet these overwhelming numbers alone. At the last moment there arrived an unexpected reinforcement, which, though small in numbers, raised the spirits of the Athenians by the friendliness it expressed. It was the entire fighting population of the little town of Platæa, a thousand men in all, who came to testify their gratitude for a former service rendered by the Athenians. =99.= All the other generals, who were to have commanded in turn, gave up their days to Miltiades, whose genius and experience alike won their confidence; but he, fearful of arousing envy, waited until his own turn came, and then gave orders for battle. The sacrifices and prayers were offered, the trumpets sounded, and, chanting a battle-hymn, the eleven thousand Greeks rushed down from the heights where they had been encamped. Instead of the usual slow march of the phalanx, they traversed the mile or more of level ground which separated them from the Persians at a full run, bearing their level spears in a straight, unwavering line.[45]