History of the Peloponnesian War

Of the islanders round Peloponnese, the Cephallenians and Zacynthians accompanied the Athenians as independent allies, although their insular position really left them little choice in the matter, owing to the maritime supremacy of Athens, while the Corcyraeans, who were not only Dorians but Corinthians, were openly serving against Corinthians and Syracusans, although colonists of the former and of the same race as the latter, under color of compulsion, but really out of free will through hatred of Corinth.

The Messenians, as they are now called in Naupactus and from Pylos, then held by the Athenians, were taken with them to the war. There were also a few Megarian exiles, whose fate it was to be now fighting against the Megarian Selinuntines.

The engagement of the rest was more of a voluntary nature. It was less the league than hatred of the Lacedaemonians and the immediate private advantage of each individual that persuaded the Dorian Argives to join the Ionian Athenians in a war against Dorians; while the Mantineans and other Arcadian mercenaries, accustomed to go against the enemy pointed out to them at the moment, were led by interest to regard the Arcadians serving with the Corinthians as just as much their enemies as any others. The Cretans and Aetolians also served for hire, and the Cretans who had joined the Rhodians in founding Gela, thus came to consent to fight for pay against, instead of for, their colonists.