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.

With these motives the Athenians received the Corcyraeans into alliance and sent to their aid, soon after the departure of the Corinthians,

ten ships commanded by Lacedaemonius son of Cimon, Diotimus son of Strombichus, and Proteas son of Epicles.

Orders were given to these not to engage with the Corinthians, unless they should sail against Corcyra and attempt to land there, or to some place belonging to the Corcyraeans; but in that case they were to thwart them if possible. The object of these orders was to avoid breaking the treaty.