The Iliad 17.540–554

So saying, he took up the bloody spoils, and set them in the car, and himself mounted thereon, his feet and his hands above all bloody, even as a lion that hath devoured a bull. being come down from heaven; for Zeus, whose voice is borne afar, had sent her to urge on the Danaans, for lo, his mind was turned. As Zeus stretcheth forth for mortals a lurid1 rainbow from out of heaven to be a portent whether of war or of chill storm that maketh men to cease from their work upon the face of the earth, and vexeth the flocks; even so Athene, enwrapping herself in a lurid cloud, entered the throng of the Danaans, and urged on each man. First to hearten him she spake to Atreus' son, valiant Menelaus, for he was nigh to her,