The Histories · 8.27

In the meantime, so soon as the disaster at Thermopylai had come about, the Thessalians sent a herald forthwith to the Phokians, against whom they had a grudge always, but especially because of the latest disaster which they had suffered: for when both the Thessalians themselves and their allies had invaded the Phokian land not many years before this expedition of the king, they had been defeated by the Phokians and handled by them roughly. For the Phokians had been shut up in Mount Parnassos having with them a soothsayer, Tellias the Eleian; and this Tellias contrived for them a device of the following kind:—he took six hundred men, the best of the Phokians, and whitened them over with chalk, both themselves and their armour, and then he attacked the Thessalians by night, telling the Phokians beforehand to slay every man whom they should see not coloured over with white. So not only…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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