... I felt the spirit of God bear testimony that there would be a work in London.
We retired to rest in good season & I felt well in my mind & slept untill 12 at night. I awoke & meditated upon the things of God untlll near 3 oclock & while forming a determination to warn the people in London & overcome the powers of Darkness by the assistance of God; A person appeared unto me which I considerd was the Prince of Darkness or the Devel. He made war with me & attempted to take my life. He caught me by the throat & choaked me nearly to death. He wounded me in my forehead. I also wounded him in a number of places in the head. As he was about to overcome me I prayed to the father in the name of Jesus for help. I then had power over him & he left me though much wounded.
3 personage dressed in white Came to me & prayed with me & I was immediately healed & delivered me from all my troubles.
[Wilford Woodruff's Journal: 1833-1898 Typescript, Volumes 1-9, Edited by Scott G. Kenney, Signature Books 1993, http://amzn.to/newmormonstudies]