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 Athenians then, were in this stage of their preparations.

Meanwhile the army of the Peloponnesians was advancing and the first point it reached in Attica was Oenoe, where they intended to begin the invasion. And while they were establishing their camp there, they prepared to assault the wall with engines and otherwise;