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.

The vanquished party now retreated, and a not inconsiderable portion of them, being hard pressed, missed their way and rushed into a piece of land belonging to some private person, which was enclosed by a great ditch and had no exit.

And when the Athenians perceived this, they shut them in by barring the entrance with hoplites, and stationing light-armed troops all round stoned all who had entered. And this was a great calamity to the Corinthians; the main body of their army, however, returned home.