The Battle of Blair Mountain was the largest armed labor uprising in United States history, with up to 15,000 coal miners battling 3,000 company defenders for five days in 1921, representing both the climax and defeat of militant labor organizing in Appalachian coalfields. This extraordinary confrontation on a West Virginia ridgeline saw the first aerial bombing of American citizens on U.S. soil, federal military intervention with over 2,000 troops, and approximately one million rounds fired in combat that would ultimately transform American labor relations. While the immediate battle ended in defeat for the miners, their struggle directly influenced New Deal legislation that eventually guaranteed workers' rights to organize and bargain collectively.