At the Battle of Stones River, General David Stanley's Union cavalry repeatedly fought General Joseph Wheeler's Confederate cavalry. The campaign saw some of the most desperately fought mounted engagements in the Civil War's Western Theater and marked the end of the Southern cavalry's dominance in Tennessee. This history describes the events leading up to the battle and the key actions, including the December 31 attack by Wheeler's cavalry, the Union counterattack, the repulse of General John Wharton by the 1st Michigan Engineers and Wheeler's daring raid on the rear of Williams Rosecrans' army. The author reassesses the actions of General John Pegram's cavalry brigade.