[Apostle Wilford Woodruff Journal] 26th The Camp was flung into some excitement this morning by the appearance of capt J. Allen with 3 draggoons of the U S Armey. I soon met Br Huntington & His Council with Capt Allen to enquire into his business. And He informed us He was sent by order of Capt Carney who had recieved word so He said By President Polk to give the Mormons an invitation to raise 500 volunteers to Assist the USA in the Mexican war. This was his pretentions. I Had some reasons to believe them to be spies & that the president Had no Hand in it. We however treated them with civility & directed them on to Council Bluffs to lay the case before the President.
[source: Wilford Woodruff's Journal: 1833-1898 Typescript, Volumes 1-9, Edited by Scott G. Kenney, Signature Books 1993, http://amzn.to/newmormonstudies]