[Exodus from Kirtland]
The Kirtland Camp of Saints travels from Kirtland to Adam-ondi-Ahman, Mo. On March 6, 1838, a meeting of the seventies in the Kirtland Temple had decided to move the Saints from Kirtland to Missouri. On July 6, 1838, a wagon train, over a mile long with over 500 Saints, leaves Kirtland for Missouri. Because of great suffering and discouragement, by the time the group reaches Springfield, Ill., about halfway, only 260 are left. They reach Adam-ondi-Ahman on October 4, 1838.
[Source: Conkling, Christopher J., Joseph Smith Chronology]