History of the Peloponnesian War

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.

The Athenians also immediately received the news of the revolt of the cities. On being informed that Aristeus and his reinforcements were on their way, they sent two thousand heavy infantry of their own citizens and forty ships against the places in revolt, under the command of Callias, son of Calliades, and four colleagues.

They arrived in Macedonia first, and found the force of a thousand men that had been first sent out, just become masters of Therme and besieging Pydna.