What most annoyed the army was the want of water; for only a little, and that foul, flowed out, or rather came by drops from a spring adjoining the sea; but Aemilius, considering that he was at the foot of the high and woody mountain Olympus, and conjecturing by the flourishing growth of the trees that there were springs that had their course underground, dug a great many holes and wells along the foot of the mountain, which were presently filled with pure water escaping from its confinement into the vacuum they afforded. Although there are some, indeed, who deny that there are reservoirs of water lying ready provided out of sight, in the places from whence springs flow, and that when they appear, they merely issue and run out; on the contrary, they say, they are then formed and come into existence for the first time, by the liquefaction of the surrounding matter; and that this change is caused by density and cold, when the moist vapour, by being closely pressed together, becomes fluid. As women's breasts are not like vessels full of milk always prepared and ready to flow from them; but their nourishment being changed in their breasts, is there made milk, and from thence is pressed out. In like manner, places of the earth that are cold and full of springs, do not contain any hidden waters or receptacles which are capable, as from a source always ready and furnished, of supplying all the brooks and deep rivers; but by compressing and condensing the vapours and air they turn them into that substance. And thus places that are dug open, flow by that pressure, and afford the more water (as the breasts of women do milk by their being sucked), the vapour thus moistening and becoming fluid; whereas ground that remains idle and undug is not capable of producing any water, whilst it wants the motion which is the cause of liquefaction. But those that assert this opinion give occasion to the doubtful to argue, that on the same ground there should be no blood in living creatures, but that it must be formed by the wound, some sort of spirit or flesh being changed into a liquid and flowing matter. Moreover, they are refuted by the fact that men who dig mines, either in sieges or for metals, meet with rivers, which are not collected by little and little (as must necessarily be, if they had their being at the very instant the earth was opened), but break out at once with violence; and upon the cutting through a rock, there often gush out great quantities of water, which then as suddenly cease. But of this enough.
Aemilius lay still for some days, and it is said that there were never two great armies so nigh that enjoyed so much quiet. When he had tried and considered all things, he was informed that there was yet one passage left unguarded, through Perrhaebia by the temple of Apollo and the Rock. Gathering, therefore, more hope from the place being left defenceless than fear from the roughness and difficulty of the passage, he proposed it for consultation. Amongst those that were present at the council, Scipio, surnamed Nasica, son-in-law to Scipio Africanus, who afterwards was so powerful in the senate-house, was the first that offered himself to command those that should be sent to encompass the enemy. Next to him, Fabius Maximus, eldest son of Aemilius, although yet very young, offered himself with great zeal. Aemilius, rejoicing, gave them, not so many as Polybius states, but, as Nasica himself tells us in a brief letter which he wrote to one of the kings with an account of the expedition, three thousand Italians that were not Romans, and his left wing consisting of five thousand. Taking with him, besides these, one hundred and twenty horsemen, and two hundred Thracians and Cretans intermixed that Harpalus had sent, he began his journey towards the sea, and encamped near the temple of Hercules, as if he designed to embark, and so to sail round and environ the enemy. But when the soldiers had supped and it was dark, he made the captains acquainted with his real intentions, and marching all night in the opposite directions away from the sea, till he came under the temple of Apollo, there rested his army. At this place Mount Olympus rises in height more than ten furlongs, as appears by the epigram made by the man that measured it:-"The summit of Olympus, at the site Where stands Apollo's temple, has a height Of full ten furlongs by the line, and more, Ten furlongs, and one hundred feet, less four.
Eumelus's son, Xenagoras, reached the place.
Adieu, O king, and do thy pilgrim grace."It is allowed, say the geometricians, that no mountain in height or sea in depth exceeds ten furlongs, and yet it seems probable that Xenagoras did not take his admeasurement carelessly, but according to the rules of art, and with instruments for the purpose. Here it was that Nasica passed the night.
A Cretan deserted, who fled to the enemy during the march, discovered to Perseus the design which the Romans had to encompass him: for he, seeing that Aemilius lay still, had not suspected any such attempt. He was startled at the news, yet did not put his army in motion, but sent ten thousand mercenary soldiers, and two thousand Macedonians, under command of Milo, with order to hasten and possess themselves of the passes. Polybius relates that the Romans found these men asleep when they attacked them; but Nasica says there was a sharp and severe conflict on the top of the mountain, that he himself encountered a mercenary Thracian, pierced him through with his javelin, and slew him; and that the enemy being forced to retreat, Milo stripped to his coat and fled shamefully without his armour, while he followed without danger, and conveyed the whole army down into the country.