Aristides

After this, Mardonius made trial of the Hellenes with that arm of his service in which he thought himself most superior. He despatched all his cavalry against them as they lay encamped at the foot of Cithaeron, in positions that were rugged and rocky—all except the Megarians. These, to the number of three thousand, were encamped the rather in open plain. For this reason they suffered severely at the hands of the cavalry, which poured in tides against them, and found access to them on every side.

Accordingly, they sent a messenger in haste to Pausanias, bidding him come to their aid, since they were unable of themselves to withstand the host of the Barbarians. Pausanias, on hearing this, and seeing at once that the camp of the Megarians was as good as hidden from view by the multitude of the enemy’s javelins and arrows, and that its defenders were huddled together in narrow quarters, on his own part had no way of rendering them aid against horsemen, since his phalanx of Spartans was full-armored and slow of movement;

but to the rest of the generals and captains of the Hellenes who were about him he proposed, in order to stir up their valor and ambition, that some of them should volunteer to make contention for the succour of the Megarians. The rest all hesitated, but Aristides, in behalf of the Athenians, undertook the task, and despatched his most zealous captain, Olympiodorus, with the three hundred picked men of his command, and archers mingled with them.