History of the Peloponnesian War

That half of the Corinthians that lay at Cenchreia to watch the Athenians, that they went not against Crommyon, saw not this battle for the hill Oneius; but when they saw the dust and so knew what was in hand, they went presently to their aid. So did also the old men of Corinth from the city when they understood how the matter had succeeded.

The Athenians, when all these were coming upon them together, imagining them to have been the succours of the neighboring cities of Peloponnesus, retired speedily to their galleys, carrying with them the booty and the bodies of their dead, all save two, which, not finding, they left.