In 1864, the Confederate military position had deteriorated significantly, prompting General Sterling Price to launch an invasion of northern Missouri with his Missouri State Guard. The objective was to influence the 1864 presidential election by capturing St. Louis and Jefferson City. As part of this broader strategy, Price encouraged guerrilla warfare, particularly targeting railroad disruption. "Bloody Bill" Anderson and his guerrilla company participated in this campaign. On September 23, 1864, Anderson had engaged in a skirmish near Rocheport in Boone County, killing eleven Union soldiers and three civilian teamsters, establishing a pattern of escalating violence in the region.
On September 27, 1864, Confederate bushwhackers under William T. Anderson's command conducted a summary execution of 24 captured Union army soldiers in Centralia, Missouri. Future outlaw Jesse James was among the killers involved in this massacre. Following this execution, a large detachment of Union mounted infantry attempted to intercept Anderson's force in the ensuing Battle of Centralia. The confrontation resulted in devastating casualties for the Union forces, with nearly all of the mounted infantry detachment being killed in combat.
The Centralia Massacre and subsequent battle demonstrated the brutal character of guerrilla warfare in Missouri during the Civil War's final year. The event highlighted both the vulnerability of Union forces when engaged by Confederate irregulars and the extreme violence that characterized bushwhacker operations. The massacre and battle became part of the wider pattern of irregular warfare that defined the Missouri campaign of 1864, contributing to the state's reputation as a particularly violent theater of the Civil War.
The early republic period saw the United States move from the weak Articles of Confederation to the federal Constitution ratified in 1788, with the Bill of Rights added in 1791. George Washington served two terms as president (1789–1797), establishing precedents for executive authority, and the federal capital moved permanently to Washington D.C. in 1800. The Louisiana Purchase (1803) doubled the nation's territory for roughly $15 million, opening vast trans-Mississippi lands to American expansion. The War of 1812 against Britain ended inconclusively but produced a surge of American national identity and eliminated most British support for Indigenous resistance east of the Mississippi. The Northwest Indian Wars (1785–1795) and the Creek War (1813–1814) broke Indigenous confederacies that had resisted US expansion. The Missouri Compromise of 1820 temporarily balanced slave and free states as the nation expanded westward, but embedded the contradiction of slavery in every subsequent territorial debate.
24 Union soldiers executed at Centralia; nearly all Union mounted infantry in the ensuing battle were killed (exact number unknown)
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