History of the Peloponnesian War
Thucydides. The Peloponnesian War. London, J. M. Dent; New York, E. P. Dutton. 1910.
With these views, Athens received Corcyra into alliance, and on the departure of the Corinthians not long afterwards, sent ten ships to their assistance.
They were commanded by Lacedaemonius, the son of Cimon, Diotimus, the son of Strombichus, and Porteas, the son of Epicles.
Their instructions were to avoid collision with the Corinthian fleet except under certain circumstances. If it sailed to Corcyra and threatened a landing on her coast, or in any of her possessions, they were to do their utmost to prevent it. These instructions were prompted by an anxiety to avoid a breach of the treaty.