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.
So they went out at daybreak in full force to the meadow along the river Anapus—for Hermocrates and his fellow-generals, as it chanced, had just come into office—and proceeded to hold a review of the hoplites. And they selected first six hundred picked men of these, under the command of Diomilus, a fugitive from Andros, that these might be a guard for Epipolae, and if there were need of them anywhere else might be quickly at hand in a body.
And the Athenians during the night preceding the day on which the Syracusans held their review, came from Catana with their whole force and put in unobserved at the place called Leon, which is six or seven stadia distant from Epipolae, disembarking the land-force there and anchoring their ships at Thapsus. That is a peninsula, with a narrow isthmus, extending into the sea and not far distant from the city of Syracuse, either by sea or by land.