Hamburg, South Carolina, sat on the Savannah River across from Augusta, Georgia — a small but economically significant town in Edgefield County. After the Civil War and the passage of the Reconstruction Acts, Hamburg had become a center of Black political life in the South Carolina lowcountry. Black men voted, held local office, and organized. The Black militia company stationed there — Company A, 9th Regiment of the South Carolina National Guard — was legally chartered, armed by the state, and commanded by Captain Dock Adams, a former enslaved man who had served in the Union Army.
Edgefield County was the stronghold of South Carolina's most aggressive white supremacist Democrats. It was the home county of Benjamin "Pitchfork Ben" Tillman, who would later become governor and senator and who celebrated his role in the massacre openly for the rest of his life. By 1876, the state's Reconstruction government — led by Republican Governor Daniel Chamberlain, with a biracial legislature that included dozens of Black officeholders — was the last functional Reconstruction government in the Deep South. Democratic leaders called its destruction "Redemption." The Hamburg Militia was, to Edgefield Democrats, a provocation: Black men, armed, organized, and operating under state authority.