The Battle of Champion Hill of May 16, 1863, was the pivotal battle in the Vicksburg Campaign of the American Civil War (1861–1865). Union Army commander Maj. Gen. Ulysses S. Grant and the Army of the Tennessee pursued the retreating Confederate States Army under Lt. Gen. John C. Pemberton and defeated it twenty miles to the east of Vicksburg, Mississippi, leading inevitably to the siege of Vicksburg and surrender. The battle is also known as Baker's Creek.