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Aemilius Chapter 13: Water problems for Aemilius[168 BC]
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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 under ground, 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 vapor, 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 vapors 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 vapor thus moistening and becoming fluid; whereas ground that remains idle and undug is not capable of producing any water, whilst it wants that 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.
Event: Battle of Pydna