"They looked back. Dark yawned the archway of the Gates under the mountain-shadow. Faint and far beneath the earth rolled the slow drum-beats: doom. A thin black smoke trailed out. Nothing else was to be seen, the dale all around was empty. Doom. Grief at last wholly overcame them, and they wept long, some standing and silent, some cast upon the ground. Doom, doom. The drum-beats faded."
The Fellowship of the Ring (Lord of the Rings #1)