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.

and they wished not to give up Corcyra to the Corinthians, with so large a navy as it had, but to wear them out as much as possible against each other, that both the Corinthians and the rest who had navies might be in a weaker condition when they went to war with them, if it should be necessary to do so.

And at the same time the island appeared to them to lie well in the line of voyage along shore to Italy and Sicily.

With such a view of the case the Athenians admitted the Corcyraeans into alliance; and when the Corinthians had departed, they sent ten ships to assist them.