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.
When all preparations had been made, and the hostages had been deposited at Cytinium in Doris, Eurylochus advanced with his army against Naupactus through the Locrian territory, taking on his march two of their towns, Oeneon and Eupalium, which refused to yield.
And when they reached the territory of Naupactus, the Aetolians meanwhile having come to their support, they ravaged the land and took the outer town, which was not fortified; and advancing against Molycreium, a colony founded by the Corinthians but subject to Athens, they took it.