History of the Peloponnesian War

It happened also that Pagondas, while the left wing of his army was in distress, sent two companies of horse secretly about the hill, whereby that wing of the Athenians which was victorious, apprehending upon their sudden appearing that they had been a fresh army, was put into affright;

and the whole army of the Athenians, now doubly terrified by this accident and by the Thebans that continually won ground and brake their ranks, betook themselves to flight. Some fled toward Delium and the sea, and some towards Oropus;

others toward the mountain Parnethus, and others other ways, as to each appeared hope of safety. The Boeotians, especially their horse and those Locrians that came in after the enemy was already defeated, followed killing them. But night surprising them, the multitude of them that fled was the easier saved.

The next day those that were gotten to Oropus and Delium went thence by sea to Athens, having left a garrison in Delium, which place, notwithstanding this defeat, they yet retained.