History of the Peloponnesian War

Upon this the Peloponnesians, desirous of aiding the Aeginetans, threw into Aegina a force of three hundred heavy infantry, who had before been serving with the Corinthians and Epidaurians. Meanwhile the Corinthians and their allies occupied the heights of Geraneia, and marched down into the Megarid, in the belief that with a large force absent in Aegina and Egypt, Athens would be unable to help the Megarians without raising the siege of Aegina.

But the Athenians, instead of moving the army of Aegina, raised a force of the old and young men that had been left in the city, and marched into the Megarid under the command of Myronides.

After a drawn battle with the Corinthians, the rival hosts parted, each with the impression that they had gained the victory.

The Athenians, however, if anything, had rather the advantage, and on the departure of the Corinthians set up a trophy. Urged by the taunts of the elders in their city, the Corinthians made their preparations, and about twelve days afterwards came and set up their trophy as victors. Sallying out from Megara, the Athenians cut off the party that was employed in erecting the trophy, and engaged and defeated the rest.