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.
For except Naxos and Catana, which I expect will side with us on account of their kinship to the Leontines, there are seven others;[*](Syracuse, Selinus, Gela, Agrigentum, Messene, Himera, Camarina (Schol.).) and these are equipped with everything in a style very like to our own armament, and not least those against which our expedition is more immediately directed, Selinus and Syracuse.
For they can supply many hoplites, archers and javelin-men, and possess many triremes and a multitude of men to man them. They have wealth, too, partly in private possession and partly in the temples at Selinus; and to the Syracusans tribute has come in from time immemorial from certain barbarians also; but their chief advantage over us is in the fact that they have many horses, and use grain that is homegrown and not imported.