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.
Besides, no small number had been killed; for the slaughter at the river had been very great—in fact, not inferior to any in this Sicilian war. And in the other frequent encounters which occurred on the march not a few had lost their lives. Notwithstanding all this, many escaped, some at the time, others afterwards, having become slaves and then making their escape; and the refuge for these was Catana.
When the forces of the Syracusans and their allies had been brought together, they took with them as many of the captives as they could and the booty and returned to the city.