The pass of Thermopylæ was not a ravine among mountains, but a narrow space between mountains and the sea. The mountains landward were steep and inaccessible; the sea was shoal. The passage between them was narrow for many miles along the shore, being narrowest at the ingress and egress. In the middle the space was broader. The place was celebrated for certain warm springs which here issued from the rocks, and which had been used in former times for baths.
The position had been considered, long before Xerxes's day, a very important one in a military point of view, as it was upon the frontier between two Greek states that were frequently at war. One of these states, of course, was Thessaly. The other was Phocis, which lay south of Thessaly. The general boundary between these two states was mountainous, and impassable for troops, so that each could invade the territories of the other only by passing round between the mountains and the shore at Thermopylæ.
The Phocæans, in order to keep the Thessalians out, had, in former times, built a wall across the way, and put up gates there, which they strongly fortified. In order still further to increase the difficulty of forcing a passage, they conducted the water of the warm springs over the ground without the wall, in such a way as to make the surface continually wet and miry. The old wall had now fallen to ruins, but the miry ground remained. The place was solitary and desolate, and overgrown with a confused and wild vegetation. On one side the view extended far and wide over the sea, with the highlands of Euboea in the distance, and on the other dark and inaccessible mountains rose, covered with forests, indented with mysterious and unexplored ravines, and frowning in a wild and gloomy majesty over the narrow passway which crept along the shore below.
The Greeks, when they retired from Thessaly, fell back upon Thermopylæ, and established themselves there. They had a force variously estimated, from three to four thousand men. These were from the different states of Greece, some within and some without the Peloponnesus-a few hundred men only being furnished, in general, from each state or kingdom. Each of these bodies of troops had its own officers, though there was one general-in-chief, who commanded the whole. This was Leonidas the Spartan. He had brought with him three hundred Spartans, as the quota furnished by that city. These men he had specially selected himself, one by one, from among the troops of the city, as men on whom he could rely.
It will be seen from the map that Thermopylæ is at some distance from the Isthmus of Corinth, and that of the states which would be protected by making a stand at the pass, some were without the isthmus and some within. These states, in sending each a few hundred men only to Thermopylæ, did not consider that they were making their full contribution to the army, but only sending forward for the emergency those that could be dispatched at once; and they were all making arrangements to supply more troops as soon as they could be raised and equipped for the service. In the mean time, however, Xerxes and his immense hordes came on faster than they had expected, and the news at length came to Leonidas, in the pass, that the Persians, with one or two millions of men, were at hand, while he had only three or four thousand at Thermopylæ to oppose them. The question arose, What was to be done?
Those of the Greeks who came from the Peloponnesus were in favor of abandoning Thermopylæ, and falling back to the isthmus. The isthmus, they maintained, was as strong and as favorable a position as the place where they were; and, by the time they had reached it, they would have received great re-enforcements; whereas, with so small a force as they had then at command, it was madness to attempt to resist the Persian millions. This plan, however, was strongly opposed by all those Greeks who represented countries without the Peloponnesus; for, by abandoning Thermopylæ, and falling back to the isthmus, their states would be left wholly at the mercy of the enemy. After some consultation and debate, it was decided to remain at Thermopylæ. The troops accordingly took up their positions in a deliberate and formal manner, and, intrenching themselves as strongly as possible, began to await the onset of the enemy. Leonidas and his three hundred were foremost in the defile, so as to be the first exposed to the attack. The rest occupied various positions along the passage, except one corps, which was stationed on the mountains above, to guard the pass in that direction. This corps was from Phocis, which, being the state nearest to the scene of conflict, had furnished a larger number of soldiers than any other. Their division numbered a thousand men. These being stationed on the declivity of the mountain, left only two or three thousand in the defile below.
From what has been said of the stern and savage character of the Spartans, one would scarcely expect in them any indications or displays of personal vanity. There was one particular, it seems, however, in regard to which they were vain, and that was in respect to their hair. They wore it very long. In fact, the length of the hair was, in their commonwealth, a mark of distinction between freemen and slaves. All the agricultural and mechanical labors were performed, as has already been stated, by the slaves, a body which constituted, in fact, the mass of the population; and the Spartan freemen, though very stern in their manners, and extremely simple and plain in their habits of life, were, it must be remembered, as proud and lofty in spirit as they were plain and poor. They constituted a military aristocracy, and a military aristocracy is always more proud and overbearing than any other.
It must be understood, therefore, that these Spartan soldiers were entirely above the performance of any useful labors; and while they prized, in character, the savage ferocity of the tiger, they had a taste, in person, for something like his savage beauty too. They were never, moreover, more particular and careful in respect to their personal appearance than when they were going into battle. The field of battle was their particular theater of display, not only of the substantial qualities of strength, fortitude, and valor, but also of such personal adornments as were consistent with the plainness and severity of their attire, and could be appreciated by a taste as rude and savage as theirs. They proceeded, therefore, when established at their post in the throat of the pass, to adorn themselves for the approaching battle.
In the mean time the armies of Xerxes were approaching. Xerxes himself, though he did not think it possible that the Greeks could have a sufficient force to offer him any effectual resistance, thought it probable that they would attempt to make a stand at the pass, and, when he began to draw near to it, he sent forward a horseman to reconnoiter the ground. The horseman rode into the pass a little way, until he came in sight of the enemy. He stopped upon an eminence to survey the scene, being all ready to turn in an instant, and fly at the top of his speed, in case he should be pursued. The Spartans looked upon him as he stood there, but seemed to consider his appearance as a circumstance of no moment, and then went on with their avocations. The horseman found, as he leisurely observed them, that there was an intrenchment thrown across the straits, and that the Spartans were in front of it. There were other forces behind, but these the horseman could not see. The Spartans were engaged, some of them in athletic sports and gymnastic exercises, and the rest in nicely arranging their dress, which was red and showy in color, though simple and plain in form, and in smoothing, adjusting, and curling their hair. In fact, they seemed to be, one and all, preparing for an entertainment.