Nat Turner led about seventy slaves on a killing spree across the plantations of Southampton, Virginia, leaving fifty-five whites dead, escalating fears that and increasing rhetoric over the slave issue. Joseph Smith would prophecy on Dec 25, 1832 that "slaves shall rise up against their masters, who shall be marshaled and disciplined for war." (D&C 87:4).
In the Evening and Morning Star Extra of July 16, 1833, W. W. Phelps reassures the Missourians that "we fear, lest, as has been the case, the blacks should rise and spill innocent blood: for they are ignorant, and a little may lead them to disturb the peace of society ..."
[Grunder, Rick, Mormon Parallels: A Bibliographic Source]