"John Brown's Body" (originally known as "John Brown's Song") is a famous Union marching song of the American Civil War. The tune arose out of the folk hymn tradition of the American camp meeting movement of the 1800s. During the American Civil War the lyrics referenced Sergeant John Brown of the Second Battalion, Boston Light Infantry Volunteer Militia, a Boston based unit. Later, people mistakenly believed it referenced the abolitionist John Brown and later verses were added referencing him.