History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
These were the allies of the Lacedaemonians. Those of the Athenians were: the Chians, Lesbians, Plataeans, the Messenians of Naupactus, most of the Acarnanians, the Corcyraeans, the Zacynthians, and in addition the cities which were tributary in the following countries: the seaboard of Caria, the Dorians adjacent to the Carians, Ionia, the Hellespont, the districts on the coast of Thrace, and the islands which lie between the Peloponnesus and Crete toward the east, with the exception of Melos and Thera.
Of these, the Chians, Lesbians, and Corcyraeans furnished ships, the rest infantry and money.
Such were the allies of each side and the preparations they made for the war.
Immediately after the affair at Plataea the Lacedaemonians sent word around to the various states in the Peloponnesus and their confederacy outside the Peloponnesus to make ready such troops and supplies as it was appropriate they should have for a foreign expedition, their intention being to invade Attica.
When everything was ready in the several states, two-thirds of the contingent of each state assembled at the appointed time at the Isthmus.