The Battle of Champion Hill, fought May 16, 1863, was the pivotal battle in the Vicksburg Campaign of the American Civil War. Union commander Maj. Gen. Ulysses S. Grant and the Army of the Tennessee pursued the retreating Confederate Lt. Gen. John C. Pemberton and defeated his army twenty miles to the east of Vicksburg, Mississippi, leading inevitably to the Siege of Vicksburg and surrender.