In 480 there appears to have been deep water close to the road, for Herodotus in his account of the final attack of the Persians on the pass speaks of many of them falling into the sea and perishing (vii. 223). The truth of this detail is strongly supported by Pausanias’ description (x. 21, 4) of how the Athenian fleet two centuries later attacked the flank of the Gauls when they were assailing the middle gate. I am inclined to think that the deep water must have been at the base of the two mounds which stand at the east end of it. The marshes spoken of (vii. 176) would be those formed at the point where the hot springs reached the shore, probably several hundred yards west of where they now come down to the aqueduct.

The breadth of half a plethron, or fifty feet, is evidently to be applied to that part of the pass which extended from the first mound westward in the direction of the modern baths (vide Plan). South of this the mountain side rises at a very steep angle, and, apart from its steepness, is practically untraversable, owing to the nature of the rock-strewn slope, and the thick brushwood which covers it.

The Phocian Wall.

The question as to the exact position of the Phocian wall is a somewhat difficult one to solve. At the same time, I see strong reason to think that the existing remains of wall foundations on the neck by which the first mound is attached to the mountain side are relics of a wall which, if not identical with, is identical in site with the one which the Phocians built.

Of this wall I noted the following details. The general line of it is distinct. It can be traced seventy or eighty yards south from the summit of the mound along the neck of the ridge, and it seems to have been carried down the north slope of the mound towards what is now the sulphur deposit but which was in former times the sea. The detail of its plan is somewhat indistinct, largely owing to its having been very much cut about in constructing rifle pits for the expected defence of the pass in the recent war with Turkey. It seems to have been planned as a series of angle bastions projecting westwards, connected by curtains a few yards long.

It is from three to three feet six inches thick, and formed of stones, some of which are roughly squared, and have an average dimension of fifteen inches by ten.

The significance of its position will best be understood when the course of the ancient road through this part of the pass is described. There can be no question as to the line of it. Coming from the west across the great mass of débris formed by the stream from the great ravine, it must have passed close to the site of the present baths. THE PHOCIAN WALL. Thence it must have run along the foot of the mountain slope until it reached the point where the first mound projects into the plain. As the sea must at that time have washed the north foot of this mound, the road must have climbed the west slope of it, which is not peculiarly steep, and must have passed over the neck which connects it with the mountain. Hence it would be blocked by this wall, which runs along the neck, and which was probably carried higher up the mountain slope to the south. I could not find any traces of its south end; that is to say, it certainly went farther up the mountain side than I could trace it. I have no reasonable doubt we have here the line, if not the actual remnants, of the wall of 480. The position is a very strong one, such as a small body of men could defend against largely superior numbers.

It seems fairly clear that the Phocians used the water from the hot springs to damage the road between this mound and the modern baths. The stream itself is not, and I do not think can have ever been, of sufficient magnitude to form a serious obstacle in itself. The defence would simply consist in making the narrow passage awkward, if not impossible for cavalry.

This suggested position of the wall accords with the details of the last struggle given in vii. 225. The Greeks fall back from the broader part of the pass (probably near the baths) to the narrow part (between that and the mound). Then they cross the wall and take their position on the mound. Furthermore, the fact mentioned at the end of the chapter, that in the assault on the mound the Persians pulled down the wall, shows pretty clearly where the latter must have been, i.e. on the mound itself.

On this mound certain stone graves have recently been found. I am afraid the discovery was made when the rifle pits were being constructed. I could only get a vague account of their position and none of their contents, if any.