The Iliad 8.245–259

So spake he, and the Father had pity on him as he wept, and vouchsafed him that his folk should be saved and not perish. Forthwith he sent an eagle, surest of omens among winged birds, holding in his talons a fawn, the young of a swift hind. Beside the fair altar of Zeus he let fall the fawn, even where the Achaeans were wont to offer sacrifice to Zeus from whom all omens come. So they, when they saw that it was from Zeus that the bird was come, leapt the more upon the Trojans and bethought them of battle. Then might no man of the Danaans, for all they were so many, vaunt that he before the son of Tydeus guided his swift horses to drive them forth across the trench and to fight man to man; nay he was first by far to slay a mailed warrior of the Trojans, even Agelaus, Phradraon's son. He in sooth had turned his horses to flee, but as he wheeled about Diomedes fixed his spear in his back between the shoulders, and drave it through his breast;