The Battle of Blair Mountain was the largest labor uprising in United States history and is the largest armed uprising since the American Civil War. The conflict occurred in Logan County, West Virginia, as part of the Coal Wars, a series of early-20th-century labor disputes in Appalachia.
For five days from late August to early September 1921, some 10,000 armed coal miners confronted 3,000 lawmen and strikebreakers (called the Logan Defenders) who were backed by coal mine operators during the miners's attempt to unionize the southwestern West Virginia coalfields when tensions rose between workers and mine management.