Trans-Mississippi Theater of The American Civil War - Missouri and Arkansas

Missouri and Arkansas

Though a slave state with a highly organized and militant secessionist movement, thanks to the pro-slavery "border ruffians" who battled antislavery militias in Kansas in the 1850s, Missourians sided with the Union by a ratio of two or three to one. Pro-Confederate Governor Claiborne F. Jackson and his small state guard under General Sterling Price linked up with Confederate forces under General Ben McCulloch. After victories at the Battle of Wilson's Creek and at Lexington, Missouri, Confederate forces were driven out of the state by the arrival of large Union forces in February 1862 and were effectively locked out by defeat at the Battle of Pea Ridge, Arkansas, on March 7 and March 8.

A guerrilla conflict began to wrack Missouri. Gangs of Confederate insurgents, commonly known as "bushwhackers", ambushed and battled Union troops and Unionist state militia forces. Much of the fighting was between Missourians of different persuasions; both sides carried out large-scale atrocities against civilians, ranging from forced resettlement to murder. Historians estimate that the population of the state fell by one-third during the war; most survived but fled or were driven out by one side or the other. Many of the most brutal bushwhacker leaders, such as William C. Quantrill and William T. "Bloody Bill" Anderson, won national notoriety. A group of their followers remained under arms and carried out robberies and murders for sixteen years after the war, under the leadership of Jesse James, his brother Frank James, and Cole Younger and his brothers.

By most measures, the Confederate guerrilla insurgency in Missouri during the Civil War was the worst such conflict ever to occur on American soil. By one calculation, nearly twenty-seven thousand Missourians died in the violence. Historians have offered various explanations for the anomalously high level of guerrilla activity in Missouri, including the possibility that the violence was linked to thousands of court-ordered sales of property belonging to the state’s Confederate sympathizers, beginning in 1862 and continuing throughout the war. The property sales arose from court judgments for defaulted debts incurred early in the war to arm rebel troops.