Old Joe was good are using other people's work. Smith's "revelation" was nothing more than Mark Twain's write-up in the St. Louis Chronicle as an estimate of the Civil War's obvious consequences. Here some other cool nonsense from old Joe:

12 of Joseph Smith’s False Prophecies:

1. Saints to gather in Independence, Missouri; build a temple - Doctrine and Covenants (D&C) 84
Church no longer teaches the gathering; temple was never built.
See Changing World of Mormonism, p. 420; Mormon Claims, p. 58; and Mormonism—Shadow or Reality? p. 192. 2. Civil War prophecy - D&C 87
England and other nations did not join in.
See Changing World, p. 424; Mormon Claims Answered, p. 59; Mormonism—Shadow or Reality? pp. 190-191, 195H. 3. Zion (Independence, Missouri) can not fall - D&C 97:19
Mormons driven out.
See Mormon Claims Answered, p. 60; Mormonism—Shadow or Reality? p. 194. 4. Army to redeem Zion (Independence, Missouri) - D&C 103
Mission unsuccessful. God seems unsure about how large an army to raise (verses 30-34).
See Mormonism—Shadow or Reality? pp. 193-194. 5. United Order - D&C 104
Commanded as everlasting order (verse 1); dissolved and reorganized (verses 48 and 53).
See Mormon Claims Answered, p. 60; Mormonism—Shadow or Reality? p. 29. 6. Riches of Salem to pay church debt - D&C 111
No riches found, debts not paid.
See Mormon Claims Answered, p. 61; Shadow, p. 49.
7. Apostle Patten to go on mission in Spring 1839 - D&C 114
Patten shot in October 1838. Wouldn’t God have known he was going to die before the next spring?
See Mormon Claims Answered, p. 61.
8. New gathering place and temple in Far West - D&C 115
LDS driven out; never built temple.
See Mormon Claims Answered, p. 62.
9. Build temple in Nauvoo and a house for the Smiths - D&C 124
Temple and house not completed.
See Mormon Claims Answered, p. 62.
10. Three grand keys to test messengers - D&C 129
No known reference where any LDS Church leader ever used this test. Does God give meaningless revelations? 11. Christ to return in 1890-1891 period - D&C 130:14-15
See Mormonism—Shadow or Reality? p. 187; Changing World of Mormonism, p. 418.
12. U.S. government must redress wrongs or be destroyed - History of the Church, vol. 5, p. 394; vol. 6, p. 116;
Millennial Star, vol. 22, p. 455.
See Mormonism—Shadow or Reality? p. 192.