History of the Peloponnesian War

And at this time, when Potidaea had revolted and the Athenian ships were cruising about Macedonia, the Corinthians, being alarmed for the place, and considering the danger to affect themselves, sent volunteers of their own people and mercenaries of the rest of the Peloponnesians, sixteen hundred heavy-armed in all and four hundred light-armed.

Their general was Aristeus, the son of Adimantus; and it was from friendship for him especially that most of the soldiers from Corinth joined the expedition as volunteers; for he was always favourably disposed towards the Potidaeans.

And they arrived in Thrace the fortieth day after Potidaea had revolted.