The History Of Herodotus Volume 2 of 2
Page: 143210. Thus saying he did not convince Xerxes, who let four days go by, expecting always that they would take to flight; but on the fifth day, when they did not depart but remained, being obstinate, as he thought, in impudence and folly, he was enraged and sent against them the Medes and the Kissians, charging them to take the men alive and bring them into his presence. Then when the Medes moved forward and attacked the Hellenes, there fell many of them, and others kept coming up continually, and they were not driven back, though suffering great loss: and they made it evident to every man, and to the king himself not least of all, that human beings are many but men are few. This combat went on throughout the day:
211, and when the Medes were being roughly handled, then these retired from the battle, and the Persians, those namely whom the king called "Immortals," of whom Hydarnes was commander, took their place and came to the attack, supposing that they at least would easily overcome the enemy. When however these also engaged in combat with the Hellenes, they gained no more success than the Median troops but the same as they, seeing that they were fighting in a place with a narrow passage, using shorter spears than the Hellenes, and not being able to take advantage of their superior numbers. The Lacedemonians meanwhile were fighting in a memorable fashion, and besides other things of which they made display, being men perfectly skilled in fighting opposed to men who were unskilled, they would turn their backs to the enemy and make a pretence of taking to flight; and the Barbarians, seeing them thus taking a flight, would follow after them with shouting and clashing of arms: then the Lacedemonians, when they were being caught up, turned and faced the Barbarians; and thus turning round they would slay innumerable multitudes of the Persians; and there fell also at these times a few of the Spartans themselves. So, as the Persians were not able to obtain any success by making trial of the entrance and attacking it by divisions and every way, they retired back.
212. And during these onsets it is said that the king, looking on, three times leapt up from his seat, struck with fear for his army. Thus they contended then: and on the following day the Barbarians strove with no better success; for because the men opposed to them were few in number, they engaged in battle with the expectation that they would be found to be disabled and would not be capable any longer of raising their hands against them in fight. The Hellenes however were ordered by companies as well as by nations, and they fought successively each in turn, excepting the Phokians, for these were posted upon the mountain to guard the path. So the Persians, finding nothing different from that which they had seen on the former day, retired back from the fight.
213. Then when the king was in a strait as to what he should do in the matter before him, Epialtes the son of Eurydemos, a Malian, came to speech with him, supposing that he would win a very great reward from the king; and this man told him of the path which leads over the mountain to Thermopylai, and brought about the destruction of those Hellenes who remained in that place. Afterwards from fear of the Lacedemonians he fled to Thessaly, and when he had fled, a price was proclaimed for his life by the Deputies, 212 when the Amphictyons met for their assembly at Pylai. 213 Then some time afterwards having returned to Antikyra he was slain by Athenades a man of Trachis. Now this Athenades killed Epialtes for another cause, which I shall set forth in the following part of the history, 214 but he was honoured for it none the less by the Lacedemonians.