 A warrior named Eumelus took the lead and Diomedes could have overtaken him easily but Apollo (who had a grudge against him) made him drop the whip.Beholding this trick played by the sun-god, Athena reacted with great anger.She not only gave the whip back to the son of Tydeus but also put fresh strength to his horses and went after Eumelus to break his yoke.