History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
Besides, after all, the Syracusans were in a worse case than themselves. What with paying mercenaries, spending upon fortified posts, and now for a full year maintaining a large navy, they were already at a loss and would soon be at a standstill: they had already spent two thousand talents and incurred heavy debts besides, and could not lose even ever so small a fraction of their present force through not paying it, without ruin to their cause; depending as they did more upon mercenaries than upon soldiers obliged to serve, like their own.
He therefore said that they ought to stay and carry on the siege, and not depart defeated in point of money, in which they were much superior.