21. While the passage of Thermopylæ was disputed, he Greek fleet advanced and took position in the strait of Artemisium, to prevent the Persian fleet from advancing farther into Greek waters. During the battle the fleets were also engaged in an indecisive conflict. A storm, however, arose and destroyed two hundred of the Persian ships. When Thermopylæ fell there was no longer reason for defending Artemisium, and the Greek fleet returned to defend the approach to Athens at the strait of Salamis. 22. Athens was now at the mercy of the conqueror. The Spartan army moved off to defend their own city. It was now that the wisdom of Themistocles showed itself. "The Athenians had no hope of being able to defend Athens, and resolved to abandon the town, and to remove their wives and children out of Attica to a place of safety. The whole population, men, women, and children, sorrowfully left their homes, and streamed down to the sea-shore, carrying what they could with them." The fleet took them over to Salamis and adjacent islands; and when Xerxes reached Athens he found it silent and deserted. A few poor or desperate men alone refused to depart, and had posted themselves behind a wooden fortification on the top of the Acropolis, the fortress and sanctuary of Athens. The Persians fired the fortifications, stormed the Acropolis, slaughtered its defenders, and burned every holy place to the ground. Athens and its citadel were in the hands of the barbarians; its inhabitants were scattered, its holy places destroyed. One hope alone remained to the Athenians--the ships which Themistocles had persuaded them to build. 23. The fleet was anchored in the strait of Salamis, and beside the two hundred ships of Athens, it consisted of a large number from other ports of Greece. Among the Greeks there were divided counsels; some were for giving immediate battle, and some were for flying from the thousand Persian ships now advancing upon them. Themistocles saw that to retreat would be ruin, and he by stratagem kept every ship in its place. He sent secret word to the Persians that the Greek fleet would soon be in full retreat, and the Persian admiral sent two hundred vessels to blockade the farther extremity of the strait, so that flight was impossible. [Illustration: BATTLE OF SALAMIS (Map)] 24. When everything was in readiness, Xerxes, from a throne built for him on the shore so that he might be a spectator of the fight, gave the signal to advance. At once all the long banks of oars in the thousand ships flashed in the light and dipped in the water. But here, as at Marathon, the way was narrow, and there was no chance for the display of the full power of the Persian fleet. In a hand-to-hand conflict they stood no chance with the Greeks, and Xerxes, with despair in his heart, saw two hundred of his best ships sunk or captured and many more seriously disabled, while the Greeks had suffered little loss.