History of the Peloponnesian War

So when the Corinthians sighted these ships before the Corcyraeans did, suspecting that they were from Athens and that there were more of them than they saw, they began to withdraw.

For the Corcyraeans, however, the Athenian ships were sailing up more out of view and could not be seen by them, and so they wondered that the Corinthians were backing water, until some of them caught sight of the ships and said, " Yonder are ships sailing up."