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.
It was an Athenian fortress on the borders of Boeotia, and the Corinthians, having called to their aid the Boeotians, were besieging it on their own account, because of a misfortune they had suffered at the hands of the garrison at Oenoe when they lost some men as they were returning from Deceleia.