Joseph Smith and other leadership of The Church of Jesus Christ of Latter-day Saints were arrested and chained to one another in a Missouri Jail. While the leadership was in jail, the rest of the Latter-day Saints were fighting for their lives. The persecution against the Saints was horrendous, and while in jail the guards in charge of the Prophet Joseph Smith were bragging about the acts the Missourians were committing against the Saints. The Prophet Joseph Smith stood up and commanded the guards to stop.
In this Youtube video the have the quotes of the eye witnesses of this event.