Thucydides, History of the Peloponnesian War
Benjamin Jowett, Ed.

44. For a long time neither would give way, but at length the Athenians, having an¹ advantage in cavalry, with which the Corinthians were unprovided, drove them back, and they retired to the summit of the ridge; where they grounded their arms and remained inactive, refusing to come down. [2] In this defeat of their right wing the Corinthians incurred the heaviest loss, and Lycophron their general was slain. The whole army was now forced back upon the high ground, where they remained in position; they were not pursued far, and made a leisurely retreat. [3] The Athenians seeing that they did not return to the attack, at once erected a trophy and began to spoil the enemies' dead and take up their own. [4] The other half of the Corinthians who were keeping guard at Cenchreae, lest the Athenians should sail against Crommyon, 'had their view of the battle intercepted by Mount Oneum. But when they saw the dust and knew what was going on, they instantly came to the rescue. The elder men of Corinth hearing of the defeat likewise hastened to the spot. [5] The united army then advanced against the Athenians, who fancying that a reinforcement had come from the neighbouring states of Peloponnesus, quickly retreated to their ships, taking their spoils and their own dead, with the exception of two whom they could not find; [6] they then embarked and sailed to the neighboring islands. Thence they sent a herald asking for a truce, and recovered the two dead bodies which were missing. The Corinthians lost two hundred and twelve men; the Athenians hardly so many as fifty.