History of the Peloponnesian War

For it began now to be felt that the coming of the Peloponnesian war was only a question of time, and no one was willing to see a naval power of such magnitude as Corcyra sacrificed to Corinth; though if they could let them weaken each other by mutual conflict, it would be no bad preparation for the struggle which Athens might one day have to wage with Corinth and the other naval powers.

At the same time the island seemed to lie conveniently on the coasting passage to Italy and Sicily.

With these views, Athens received Corcyra into alliance, and on the departure of the Corinthians not long afterwards, sent ten ships to their assistance.