Filled the Enemy with Madness

Gandalf and the Riders of Rohan descend upon the Orcs at the end of the battle of Helm's Deep--

Down leaped Shadowfax, like a deer that runs surefooted in the mountains. The White Rider was upon them, and the terror of his coming filled the enemy with madness. The wild men fell on their faces before him. The Orcs reeled and screamed and cast aside both sword and spear. Like a black smoke driven by a mounting wind they fled. Wailing they passed under the waiting shadow of the trees; and from that shadow none ever came again.

--J. R. R. Tolkien, The Two Towers, p. 529