Missouri governor Lilburn Boggs issues the Extermination Order, which orders all Mormons to leave the state or be killed.

Lilburn Williams Boggs was the sixth Governor of Missouri, from 1836 to 1840. He is now most widely remembered for his interactions with Joseph Smith and Porter Rockwell, and Missouri Executive Order 44, known by Mormons as the "Extermination Order", issued in response to the ongoing conflict between church members and other settlers of Missouri. Boggs was also a key player in the Honey War of 1837.

Missouri Executive Order 44 was a state executive order issued by Missouri Governor Lilburn Boggs on October 27, 1838, in response to the Battle of Crooked River. The clash had been triggered when a state militia unit from Ray County seized several Mormon hostages from Caldwell County, and the subsequent attempt by the Mormons to rescue them.