History of the Peloponnesian War

That which was left together of this army to the public was not much; but they that were conveyed away by stealth were very many;

and all Sicily was filled with them, because they were not taken, as those with Demosthenes were, by composition. Besides, a great part [of these] were slain; for the slaughter [at this time] was exceeding great, none greater in all the Sicilian war. They were also not a few that died in those other assaults in their march. Nevertheless, many also escaped, some then presently and some by running away after servitude; the rendezvous of whom was Catana.

The Syracusians and their confederates, being come together, returned with their prisoners, all they could get, and with the spoil into the city.

As for all the other prisoners of the Athenians and their confederates, they put them into the quarries as the safest custody. But Nicias and Demosthenes they killed, against Gylippus' will. For Gylippus thought the victory would be very honourable if, over and above all his other success, he could carry home both the generals of the enemy to Lacedaemon.

And it fell out that one of them, Demosthenes, was their greatest enemy for the things he had done in the island and at Pylus; and the other, upon the same occasion, their greatest friend. For Nicias had earnestly laboured to have those prisoners which were taken in the island to be set at liberty by persuading the Athenians to the peace.