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.

To the Athenians too came immediately the tidings of the cities having revolted; and when they found that the forces with Aristeus had gone there besides, they sent two thousand heavy-armed of their own men and forty slips to the revolted towns, with Callias, the son of Calliades, as general with four others;