History of the Peloponnesian War

In the meantime after Potidaea was revolted, and whilst the Athenian fleet lay on the coast of Macedonia, the Corinthians, fearing what might become of the city and making the danger their own, sent unto it, both of their own city and of other Peloponnesians which they hired, to the number of sixteen hundred men of arms and four hundred light armed.

The charge of these was given to Aristeus the son of Adimantus, for whose sake most of the volunteers of Corinth went the voyage: for he had been ever a great favourer of the Potidaeans.

And they arrived in Thrace after the revolt of Potidaea forty days.