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.
When the army had assembled at Delphi, Eurylochus sent a herald to the Locri Ozole; for the route to Naupactus was through their territory, and moreover he wished to make them revolt from the Athenians.