History of the Peloponnesian War

On the other side, there opposed them on the part of the Syracusians, the Camarinaeans their borderers; and beyond them again the Geloans;

and then (the Agrigentines not stirring) beyond them again the same way, the Selinuntians. These inhabit the part of Sicily that lieth opposite to Afric. Then the Himeraeans, on the side that lieth on the Tyrrhene sea, where they are the only Grecians inhabiting, and only aided them.

These were their confederates of the Greek nation within Sicily, all Dorians and free states. Then of the barbarians there, they had the Siculi, all but what revolted to the Athenians. For Grecians without Sicily, the Lacedaemonians sent them a Spartan commander, with some Helotes and the rest freedmen. Then aided them both with galleys and with land men the Corinthians only; and for kindred's sake, the Leucadians and Ambraciotes; out of Arcadia, those mercenaries sent by the Corinthians; and Sicyonians on constraint; and from without Peloponnesus, the Boeotians.

To the foreign aids the Sicilians themselves, as being great cities, added more in every kind than as much again; for they got together men of arms, galleys, and horses, great store, and other number in abundance. And to all these again the Syracusians themselves added, as I may say, about as much more, in respect of the greatness both of their city and of their danger.