(Isa. 13:4)
This has reference to gathering of the Saints in the Rocky Mountains. On 6 August 1842, Joseph Smith prophesied that some of the Saints would “live to go and assist in making settlements and build cities and see the saints become a mighty people in the midst of the Rocky Mountains.” (Teachings of the Prophet Joseph Smith, 255; emphasis added.)
(Donald W. Parry, Jay A. Parry, and Tina M. Peterson, Understanding Isaiah [Salt Lake City: Deseret Book Co., 1998], 131–132.)