Eurybiades, by reason of the greatness of Sparta, was admiral of the Greek fleet, but yet was faint-hearted in time of danger, and willing to weigh anchor and set sail for the isthmus of Corinth, near which the land army lay encamped; which Themistocles resisted;and this was the occasion of the well-known words, when Eurybiades, to check his impatience, told him that at the Olympic games they that start up before the rest are lashed; "And they," replied Themistocles, "that are left behind are not crowned." Again, Eurybiades lifting up his staff as if he were going to strike, Themistocles said, "Strike if you will, but hear;" Eurybiades, wondering much at his moderation, desired him to speak, and Themistocles now brought him to a better understanding. And when one who stood by him told him that it did not become those who had neither city nor house to lose, to persuade others to relinquish their habitations and forsake their countries, Themistocles gave this reply: "We have indeed left our houses and our walls, base fellow, not thinking it fit to become slaves for the sake of things that have no life nor soul; and yet our city is the greatest of all Greece, consisting of two hundred galleys, which are here to defend you, if you please; but if you run away and betray us, as you did once before, the Greeks shall soon hear news of the Athenians possessing as fair a country, and as large and free a city, as that they have lost." These expressions of Themistocles made Eurybiades suspect that if he retreated the Athenians would fall off from him. When one of Eretria began to oppose him, he said, "Have you anything to say of war, that are like an inkfish? you have a sword, but no heart." Some say that while Themistocles was thus speaking upon the deck, an owl was seen flying to the right hand of the fleet, which came and sate upon the top of the mast; and this happy omen so far disposed the Greeks to follow his advice, that they presently prepared to fight. Yet, when the enemy's fleet was arrived at the haven of Phalerum, upon the coast of Attica, and with the number of their ships concealed all the shore, and when they saw the king himself in person come down with his land army to the seaside, with all his forces united, then the good counsel of Themistocles was soon forgotten, and the Peloponnesians cast their eyes again towards the isthmus, and took it very ill if any one spoke against their returning home; and, resolving to depart that night, the pilots had orders what course to steer.
Themistocles, in great distress that the Greeks should retire, and lose the advantage of the narrow seas and strait passage, and slip home every one to his own city, considered with himself, and contrived that stratagem that was carried out by Sicinnus. This Sicinnus was a Persian captive, but a great lover of Themistocles, and the attendant of his children. Upon this occasion, he sent him privately to Xerxes, commanding him to tell the king that Themistocles, the admiral of the Athenians, having espoused his interest, wished to be the first to inform him that the Greeks were ready to make their escape, and that he counselled him to hinder their flight, to set upon them while they were in this confusion and at a distance from their land army, and hereby destroy all their forces by sea. Xerxes was very joyful at this message, and received it as from one who wished him all that was good, and immediately issued instructions to the commanders of his ships, that they should instantly set out with two hundred galleys to encompass all the islands, and enclose all the straits and passages, that none of the Greeks might escape, and that they should afterwards follow with the rest of their fleet at leisure. This being done, Aristides, the son of Lysimachus, was the first man that perceived it, and went to the tent of Themistocles, not out of any friendship, for he had been formerly banished by his means, as has been related, but to inform him how they were encompassed by their enemies. Themistocles, knowing the generosity of Aristides, and much struck by his visit at that time, imparted to him all that he had transacted by Sicinnus, and entreated him that, as he would be more readily believed among the Greeks, he would make use of his credit to help to induce them to stay and fight their enemies in the narrow seas. Aristides applauded Themistocles, and went to the other commanders and captains of the galleys, and encouraged them to engage;yet they did not perfectly assent to him, till a galley of Tenos, which deserted from the Persians, of which Panaetius was commander, came in, while they were still doubting, and confirmed the news that all the straits and passages were beset; and then their rage and fury, as well as their necessity, provoked them all to fight.
As soon as it was day, Xerxes placed himself high up, to view his fleet, and how it was set in order. Phanodemus says, he sat upon a promontory above the temple of Hercules, where the coast of Attica is separated from the island by a narrow channel; but Acestodorus writes, that it was in the confines of Megara, upon those hills which are called the Horns, where he sat in a chair of gold, with many secretaries about him to write down all that was done in the fight.