The Iliad 21.16–30

and that he smote and smote; and from them uprose hideous groaning as they were smitten with the sword, and the water grew red with blood. And as before a dolphin, huge of maw, other fishes flee and fill the nooks of some harbour of fair anchorage in their terror, for greedily doth he devour whatsoever one he catcheth; even so cowered the Trojans in the streams of the dread river beneath the steep banks. And he, when his hands grew weary of slaying, chose twelve youths alive from out the river as blood-price for dead Patroclus, son of Menoetius. These led he forth dazed like fawns, and bound their hands behind them with shapely thongs, which they themselves wore about their pliant tunics, and gave them to his comrades to lead to the hollow ships. Then himself he sprang back again, full eager to slay.