History of the Peloponnesian War

And [not only] the Syracusians standing along the farther bank, being a steep one, killed the Athenians with their shot from above as they were many of them greedily drinking and troubling one another in the hollow of the river;

but the Peloponnesians came also down and slew them with their swords, and those especially that were in the river. And suddenly the water was corrupted; nevertheless they drunk it, foul as it was with blood and mire; and many also fought for it.

In the end, when many dead lay heaped in the river, and the army was utterly defeated, part at the river, and part (if any gat away) by the horsemen, Nicias yielded himself unto Gylippus (having more confidence in him than in the Syracusians) to be for his own person at the discretion of him and the Lacedaemonians, and no further slaughter to be made of the soldiers.

Gylippus from thenceforth commanded to take prisoners. So the residue, except such as were hidden from them (which were many), they carried alive into the city. They sent also to pursue the three hundred which brake through their guards in the night, and took them.