The spirit of God rested upon me. I spent the night at Mr John Smith's & I dreamed of Seeing the great Draggon or beast with all of his heads and horns to the number of six hundred three score and six. He was about 20 rods in length with many riding upon his back without fear or alarm. 9 miles.
[Source: Wilford Woodruff's Journal: 1833-1898 Typescript, Volumes 1-9, Edited by Scott G. Kenney, Signature Books 1993, http://amzn.to/newmormonstudies]