His career traced a consistent arc from slave trader to Confederate general to Klan leader, each role reinforcing the others in ways that made him a central figure in both the Civil War and the violent resistance to Reconstruction. The massacre at Fort Pillow — where Union soldiers, disproportionately Black, were killed after resistance had effectively ended — remains the most scrutinized episode of his military command, with historians still debating the degree of his direct culpability. His later position as the Klan's first Grand Wizard placed him at the head of an organization that used systematic terror to undermine Black civil and political life in the postwar South.