Hydarnes, commanding the Immortals, set out under the guidance of the traitor. As they left the Persian encampment darkness was falling and lamps began here and there to glimmer. The guide led the way into the wild ravine of the Asôpos. If outside the light was failing, here it was already night. Far above their heads the men could see a star or two shining between the narrow slit where the sheer walls of the gorge seemed almost to meet, so high they were. The path, by which a laden mule could with difficulty pass, followed the course of the rushing stream over gravel and between great boulders. It was part of the old hill-road to Delphi and well known to pilgrims and bandits. It had an evil reputation. “It hath ever been put to an ill use by the Malians.” (We can imagine to what sort of use our Malian had been wont to put it.) Moreover the Asôpos would sometimes rise suddenly and come roaring in spate down the gulley, flooding over the road. A sinister path.
For about three miles the Persians in Indian file threaded the ravine, which then opened out into a valley, up the slope of which they toiled, aided by their spears, along a track getting ever rougher and steeper. Sometimes the way would conduct them through a pitchy wood of firs. Now and again a man would stumble in the thick scrub or over a projecting edge of rock. Superstitious terror, begotten of the darkness upon such hills in the minds of those worshippers of Ahriman, troubled and silenced them. They emerged at last on a kind of rocky pavement. Then they descended a ravine and climbed the opposing slope. As they climbed the darkness lifted a little; a faint glimmer came from their golden bangles and the pomegranates of gold and silver on the butt of their spears. When they reached the summit of the path called Anopaia which they had so long been following, the dawn was clear behind the acute peak of Mount Saromata.
Anopaia was not unknown to the defenders of the Pass, and Leonidas had detached his Phocian contingent to guard it. In the silence of that windless night, in the hour before the break of day, the Phocian outposts heard a mysterious sound—a sort of light, dry, continuous roar, gradually growing nearer and louder. It was the Persians passing through an oak wood and dispersing with their feet the fallen leaves of many autumns. Suddenly the men appeared in the open. The Phocians were taken by surprise. Under a shower of arrows they retreated upon a little fort crowning a height about half a mile away. There they awaited the attack of Hydarnes. But he, neglecting these Phocians, pressed on along the path, which now began to descend, very steep and narrow. In no long time he would be on the road behind Leonidas. The Pass was turned.
While it was yet night, deserters had come to the Greeks with news of the march across the mountain. Soon after scouts came running down from the heights confirming the tale. Tradition says that Leonidas in so desperate a case bade his allies depart and save themselves; as for himself and his men, their orders were to defend the Pass to the utmost. It has, however, been recently suggested that the contingents which withdrew went to meet Hydarnes. If such was their purpose, either they came too late, or missed the enemy, or like the Phocians shrank from the conflict with the odds so heavy against them. At any rate they now pass out of the story. They were all the Greek forces save the Lacedaemonians, the thousand who must have composed nearly the whole fighting power of Thespiai, and four hundred Thebans. Of these the Thebans, it is said, were retained by Leonidas as hostages, their city being tainted already with suspicion of disloyalty. Yet they may have been true men. But the Thespians stayed willingly. Even when it was known that Hydarnes could not be stopped, they chose to stay. They had no traditional code of military honour like the Spartans; their proportionate stake was twenty times greater. “Their leader was Demophilos the son of Diadromês, their bravest man was Dithyrambos the son of Harmatidas.”
It was full daylight when Xerxes according to arrangement attacked. The Greeks, who hitherto had lined up behind the old wall which the Persian scout had seen drawn along the ridge of a mound within the narrowest part of the Pass, now, knowing the end was come, issued forth into the broader space beyond. Then followed a fight which men who only read of it never forget. The Barbarians came on in wave upon wave; the Greeks slew and slew. They could see the Persian officers lashing on their men with whips to the assault. Now and again one of themselves would fall with a rattle of bronze. But the enemy fell in heaps. Many were thrust into the sea and drowned; still more were trampled to death beneath the feet of their fellows. Two brothers of Xerxes were slain.
Then Leonidas fell.
The Spartans gathered about their king and fought to rescue the body. By this time their spears were broken, and they were fighting with their swords. One of the two men who had been left behind at the base in the last stages of ophthalmia appeared, led by his servant. The helot turned the face of his master towards the enemy and fled. The blind man stumbled forward, striking wildly, until he was killed. Four times the Barbarians were driven back, and the body of Leonidas was saved.
Word came that the Immortals were on the road behind them. Therefore the Greeks changed their plan of battle and retreated to the narrower portion of the Pass; all but the Thebans, who surrendered to the foe. The men of Sparta and Thespiai fought their way back to the mound and behind the stone wall across the mound, and there made their final stand. With cries the Barbarians swarmed about them on front and flank and rear. In a moment the wall was down. Such of the Greeks as still had swords kept using them. When their swords were gone, they fought with their bare hands; and died at last rending their enemies’ flesh like wolves with their teeth.
Thus, and not more easily, did Xerxes win through the Pass.