History of the Peloponnesian War

The Athenian galleys, when they arrived in Thrace, found Potidaea and the other cities already revolted.

And the commanders of the fleet, conceiving it to be impossible, with their present forces, to make war both against Perdiccas and the towns revolted, set sail again for Macedonia, against which they had been at first sent out, and there staying, joined with Philip and the brothers of Derdas that had invaded the country from above.