History of the Peloponnesian War

An indecisive battle was fought with the Corinthians, whereupon they separated, each side thinking they had not got the worst of it in the action.

And the Athenians, who had in fact got rather the better of it, when the Corinthians withdrew, set up a trophy; but the Corinthians, being reproached by the older men in their city, made their preparations and about twelve days later came back and set up for themselves a rival trophy, as though they had won. Hereupon the Athenians made a sally from Megara, slew those who were setting up the trophy, and joining battle with the rest defeated them.