Histories
Herodotus
Herodotus. Godley, Alfred Denis, translator. Cambridge, MA; London: Harvard University Press; William Heinemann, Ltd., 1920-1925 (printing).
So the Scythians went searching for their enemies through the parts of their own country where there was forage for the horses and water, supposing that they, too, were heading for such places in their flight; but the Persians kept to their own former tracks, and so with much trouble they found the crossing.