History of the Peloponnesian War

For Perdiccas had also persuaded the Chalcideans to abandon and pull down their maritime towns and to go up and dwell at Olynthus and that one city to make strong, and unto those that removed gave part of his own and part of the territory of Mygdonia, about the lake Bolbe, to live on so long as the war against the Athenians should continue. So when they had demolished their cities and were gone up higher into the country, they prepared themselves to the 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.