History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
The naval force of the Athenians, having run a stockade across the isthmus, lay quiet on Thapsus; but the land-force advanced at once at a run to Epipolae, and got up by way of Euryelus before the Syracusans, when they became aware of it, could come up from the review which they were holding in the meadow.
They brought aid, however, everyone with what speed he could, the others as well as the six hundred under Diomilus; but they had not less than twenty-five stadia to go, after leaving the meadow, before they reached the enemy.