History of the Peloponnesian War

Indeed no small part was actually put to death; for this was the most extensive slaughter, and surpassed by none of all that occurred in this Sicilian war. In the other encounters also, which were frequent on their march, no few had fallen. But many also escaped, nevertheless; some at the moment, others after serving as slaves, and running away subsequently. These found a place of refuge at Catana.

When the Syracusans and allies were assembled together, they took with them as many prisoners as they could, with the spoils, and returned to the city.

All the rest of the Athenians and the allies that they had taken, they sent down into the quarries, thinking this the safest way of keeping them: but Nicias and Demosthenes they executed, against the wish of Gylippus. For he thought it would be a glorious distinction for him, in addition to all his other achievements, to take to the Lacedaemonians even the generals who had commanded against them.

And it so happened, that one of these, namely Demosthenes, was regarded by them as their most inveterate enemy, in consequence of what had occurred on the island and at Pylus; the other, for the same reasons, as most in their interest; for Nicias had exerted himself for the release of the Lacedaemonians taken from the island, by persuading the Athenians to make a treaty.