History of the Peloponnesian War
Thucydides
Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.
The Athenians then were in this state of preparation.
As for the army of the Peloponnesians, on the other hand, the first town it came to in Attica was Oenoe, at which point they intended to make their inroad.