The Iliad by Homer Book 15 Page 20

Before him went Phoebus Apollo shrouded in cloud about his shoulders. He bore aloft the terrible aegis with its shaggy fringe, which Vulcan the smith had given Jove to strike terror into the hearts of men. With this in his hand he led on the Trojans.

The Argives held together and stood their ground. The cry of battle rose high from either side, and the arrows flew from the bowstrings. Many a spear sped from strong hands and fastened in the bodies of many a valiant warrior, while others fell to earth midway, before they could taste of man’s fair flesh and glut themselves with blood. So long as Phoebus Apollo held his aegis quietly and without shaking it, the weapons on either side took effect and the people fell, but when he shook it straight in the face of the Danaans and raised his mighty battle-cry their hearts