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.
About this same time the Athenians sent out thirty ships to operate around Locris and at the same time to serve as a guard for Euboea.
These were under the command of Cleopompus son of Clinias, who made descents upon various places along the seaboard and ravaged them, captured Thronium, some of whose inhabitants he took as hostages, and at Alope defeated in battle the Locrians who came to the defence of the town.