History of the Peloponnesian War

And they arrived on the coast of Thrace on the fortieth day after the revolt of Potidaea.

The news of the revolt of the cities quickly reached the Athenians also; and when they learned that troops under Aristeus were also on the way to support the rebels, they sent against the places in revolt two thousand of their own hoplites and forty ships, under Callias son of Calliades with four other generals.

These first came to Macedonia and found that the former thousand had just taken Therme and were besieging Pydna;