Meanwhile the Potidæans sent envoys to Athens on the chance of persuading them to take no new steps in their matters; they also went to Lacedaemon with the Corinthians to secure support in case of need. Failing after prolonged negotiation to obtain anything satisfactory from the Athenians; being unable, for all they could say, to prevent the vessels that were destined for Macedonia from also sailing against them; and receiving from the Lacedaemonian government a promise to invade Attica, if the Athenians should attack Potidæa, the Potidæans, thus favoured by the moment, at last entered into league with the Chalcidians and Bottiaeans, and revolted. And Perdiccas induced the Chalcidians to abandon and demolish their towns on the seaboard and, settling inland at Olynthus, to make that one city a strong place: meanwhile to those who followed his advice he gave a part of his territory in Mygdonia round Lake Bolbe as a place of abode while the war against the Athenians should last. They accordingly demolished their towns, removed inland and prepared for war. The thirty ships of the Athenians, arriving before the Thracian places, found Potidæa and the rest in revolt. Their commanders, considering it to be quite impossible with their present force to carry on war with Perdiccas and with the confederate towns as well turned to Macedonia, their original destination, and, having established themselves there, carried on war in co-operation with Philip, and the brothers of Derdas, who had invaded the country from the interior. Meanwhile the Corinthians, with Potidæa in revolt and the Athenian ships on the coast of Macedonia, alarmed for the safety of the place and thinking its danger theirs, sent volunteers from Corinth, and mercenaries from the rest of Peloponnese, to the number of sixteen hundred heavy infantry in all, and four hundred light troops. Aristeus, son of Adimantus, who was always a steady friend to the Potidæans, 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 Potidæa.