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.