History of the Peloponnesian War

Meanwhile the Corinthians, with Potidaea in revolt, and the Athenian ships on the coast of Macedonia, alarmed for the safety of the place, and thinking its danger theirs, sent volunteers from Corinth, and mercenaries from the rest of Peloponnese, to the number of sixteen hundred heavy infantry in all, and four hundred light troops.

Aristeus, son of Adimantus, who was always a steady friend to the Potidaeans, took command of the expedition, and it was principally for love of him that most of the men from Corinth volunteered.

They arrived in Thrace forty days after the revolt of Potidaea.