Bishop Thirlwall calls our attention to a passage in Suidas, where the proverb KHORIS HIPPEIS is said to have originated from some Ionian Greeks, who were serving compulsorily in the army of Datis, contriving to inform Miltiades that the Persian cavalry had gone away, whereupon Miltiades immediately joined battle and gained the victory. There may probably be a gleam of truth in this legend. If Datis's cavalry was numerous, as the abundant pastures of Euboea were close at hand, the Persian general, when he thought, from the inaction of his enemy, that they did not mean to come down from the heights and give battle, might naturally send the larger part of his horse back across the channel to the neighbourhood of Eretria, where he had already left a detachment, and where his military stores must have been deposited. The knowledge of such a movement would of course confirm Miltiades in his resolution to bring on a speedy engagement. But, in truth, whatever amount of cavalry we suppose Datis to have had with him on the day of Marathon, their inaction in the battle is intelligible, if we believe the attack of the Athenian spearmen to have been as sudden as it was rapid. The Persian horse-soldier, on an alarm being given, had to take the shackles off his horse, to strap the saddle on, and bridle him, besides equipping himself (see Xenoph. Anab. lib.iii c.4); and when each individual horseman was ready, the line had to be formed; and the time that it takes to form the Oriental cavalry in line for a charge, has, in all ages, been observed by Europeans. The wet state of the marshes at each end of the plain, in the time of year when the battle was fought, has been adverted to by Mr Wordsworth; and this would hinder the Persian general from arranging and employing his horsemen on his extreme wings, while it also enabled the Greeks, as they came forward, to occupy the whole breadth of the practicable ground with an unbroken line of levelled spears, against which, if any Persian horse advanced they would be driven back in confusion upon their own foot. Even numerous and fully-arrayed bodies of cavalry have been repeatedly broken, both in ancient and modern warfare, by resolute charges of infantry. For instance, it was by an attack of some picked cohorts that Caesar routed the Pompeian cavalry, which had previously defeated his own at Pharsalia. I have represented the battle of Marathon as beginning in the afternoon, and ending towards evening. If it had lasted all day, Herodotus would have probably mentioned that fact. That it ended towards evening is, I think, proved by the line from the "Vespae" which I have already quoted, and to which my attention was called by Sir Edward Bulwer Lytton's account of the battle. I think that the succeeding lines in Aristophanes, also already quoted, justify the description which I have given of the rear-ranks of the Persians keeping up a flight of arrows over the heads of their comrades against the Greeks.