History of the Peloponnesian War

Now the Potidaeans and the Peloponnesians with Aristeus, in expectation of the Athenians, were encamped towards Olynthus, on the isthmus, and had established their market outside the city.

As general of all the infantry the allies had chosen Aristeus; of the cavalry, Perdiccas; for he had broken terms again immediately with the Athenians, and was in alliance with the Potidaeans, having appointed Iolaus to represent him as commander.

The plan of Aristeus was to keep his own force [*](ἔχοντι.] Constructio ad sensum facta: nam verborum τοϋ αρ́ιστέως νώμη ἦν idem sensus, ac si dixisset τῷ ʼαριστεῖ ἔδοξε.—Göller.) on the isthmus, and watch the Athenians, in case of their coming against them; while the Chalcidians, and the allies beyond the isthmus, and the two hundred cavalry with Perdiccas, should remain at Olynthus; and when the Athenians advanced against his force, they should come up in their rear to assist him, and enclose the enemy between them.

But on the other hand, Callias, the general of the Athenians and his fellow-commanders, despatch the cavalry of the Macedonians and a few of the allies towards Olynthus, to prevent the troops there from giving any assistance; while they themselves broke up their camp, and proceeded to Potidaea.

And when they were at the isthmus, and saw the enemy preparing for battle, they also took an opposite position; and not long after they began the engagement.

And just the wing of Aristeus, and such picked troops of the Corinthians and the rest as were around him, routed the wing opposed to them, and advanced in pursuit a considerable distance; but the remaining force of the Potidaeans and Peloponnesians was beaten by the Athenians, and fled within the wall for refuge.