History of the Peloponnesian War

They gained over some few men on the island by secretly sending friends with instructions to provide them with a boat, and to tell them, as if for their own sakes, that they had best escape as quickly as possible, as the Athenian generals were going to give them up to the Corcyraean people.

These representations succeeding, it was so arranged that the men were caught sailing out in the boat that was provided, and the treaty became void accordingly, and the whole were given up to the Corcyraeans.