Orson Pratt was a member of the Original Council of the Twelve Apostles of the Mormon Church. This self-explanatory vision of his was recorded in Vol. 20 of the Church’s Journal of Discourses:
§ "What then will be the condition of the people when the great and dreadful war will come? It will be very different from the war between the North and South. It will be neighborhood against neighborhood, city against city, town against town, state against state, and they will go forth destroying and being destroyed. Manufacturing will almost cease, great cities will be left desolate. The time will come when the great city of New York will be left without inhabitants...
§ "When that day shall come (when the missionaries will be called home) there shall be wars, not such wars as have come in centuries and years that are past and gone, but a dsolating war. When I say desolating, I mean that it will lay these european nations in waste. Cities will be left vacated, without inhabitants. The people will be destroyed by the sword of their own hands. Not only this but many other cities will be burned; for when contending armies are wrought up with the terrible anger, without the Spirit of God upon them, when they have not that spirit of humanity that now characterizes many of the wars amongst nations, when they are left to themselves, there will be no quarter given, no prisoners taken, but a war of destruction, of desolation, of the burning of the cities and villages, until the land is laid desolate." (J. Disc. 20: 150) 1
1. Taken from Prophecy –A History of the Future (Internet Edition), by Robert A. Nelson at http://www.rexresearch.com/prophist/phf8usa.htm