Philippic 1
Demosthenes
Demosthenes. Vol. I. Olynthiacs, Philippics, Minor Public Speeches, Speech Against Leptines, I-XVII, XX. Vince, J. H., translator. Cambridge, MA: Harvard University Press, 1930 (printing).
So I propose that the whole force should consist of two thousand men, but of these five hundred must be Athenians, chosen from any suitable age and serving in relays for a specified period—not a long one, but just so long as seems advisable; the rest should be mercenaries. Attached to them will be two hundred cavalry, fifty at least of them being Athenians, serving on the same terms as the infantry. There will also be cavalry transports provided.