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The Battle of Hoover's Gap (24 June 1863) was the principal battle in the Tullahoma Campaign of the American Civil War, in which Union Gen. William S. Rosecrans drove Gen. Braxton Bragg’s Confederates out of Central Tennessee. Rosecrans’ feigned move on the western end of the Confederate line had left the eastern mountain passes lightly defended, and Col. John T. Wilder's mounted infantry achieved total surprise when they attacked Hoover's Gap. Success was attributed both to Rosecrans’ brilliant deception tactics and the high morale of Wilder’s "Lightning Brigade", equipped with the new Spencer repeating rifle.