History of the Peloponnesian War

The Corinthians had heard from Argos of the coming of the Athenian armament, and had all come up to the Isthmus long before, with the exception of those who lived beyond it, and also of five hundred who were away in garrison in Ambracia and Leucadia; and they were there in full force watching for the Athenians to land.

These last, however, gave them the slip by coming in the dark; and being informed by signals of the fact, the Corinthians left half their number at Cenchreae, in case the Athenians should go against Crommyon, and marched in all haste to the rescue.