The Iliad 16.145–159

And the horses he bade Automedon yoke speedily, even him that he honoured most after Achilles, breaker of the ranks of men, and that in his eyes was faithful above all to abide his call in battle. At his bidding then Automedon led beneath the yoke the fleet horses, Xanthus and Balius, that flew swift as the winds, horses that the Harpy Podarge conceived to the West Wind, as she grazed on the meadow beside the stream of Oceanus. And in the side-traces he set the goodly Pedasus that on a time Achilles had brought away, when he took the city of Eetion; and he, being but mortal, kept pace with immortal steeds. But Achilles went to and fro throughout the huts and let harness in their armour all the Myrmidons, and they rushed forth like ravening wolves in whose hearts is fury unspeakable—wolves that have slain in the hills a great horned stag, and rend him, and the jaws of all are red with gore;