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.
This treasure they might use for selfpreservation, but they must replace as much as they took. As to their resources in money, then, he thus sought to encourage them;
and as to heavv-armed infantry, he told them that there were thirteen thousand, not counting the sixteen thousand men who garrisoned the forts and manned the city walls. For this was the number engaged in garrison duty at first, when the enemy were invading Attica, and they were composed of the oldest and the youngest[*](The age limits were eighteen to sixty, those from eighteen to twenty (peri/poloi) being called on only for garrison duty within the bounds of Attica. The age of full citizenship was twenty.) citizens and of such metics as were heavily armed. For the length of the Phalerian wall was thirty-five stadia to the circuit-wall of the city, and the portion of the circuit-wall itself which was guarded was fortythree stadia (a portion being left unguarded, that between the Long Wall and the Phalerian); and the Long Walls to the Peiraeus were forty stadia in extent, of which only the outside one was guarded; and the whole circuit of the Peiraeus including Munichia was sixty stadia, half of it being under guard.