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. Background Following the Union occupation of Jackson, Mississippi, on May 14, both Confederate and Federal forces made plans for future operations. General Joseph E. Johnston, commanding all Confederate forces in Mississippi, retreated with most of his army up the Canton Road. However, he ordered Lt. Gen. John C. Pemberton, commanding three divisions totaling about 23,000 men, to leave Edwards Station and attack the Federals at Clinton. Pemberton and his generals felt that Johnston's plan was likely to result in disaster and decided instead to attack the Union supply trains moving from Grand Gulf to Raymond. On May 16, however, Pemberton received another message from Johnston repeating his former orders. Pemberton had already started after the supply trains and was on the Raymond-Edwards Road, with his rear at a crossroads one-third mile south of the crest of Champion Hill. When he obediently ordered a countermarch, his rear, including his supply wagons, had become the vanguard of his attack. Opposing forces Union Confederate Battle Around 7 am on May 16, Union forces engaged the Confederates and the Battle of Champion Hill began. Pemberton's force formed into a three-mile (5 km)-long defensive line that ran southwest to northeast along a crest of a ridge overlooking Jackson Creek. Grant wrote in his Personal Memoirs, "... where Pemberton had chosen his position to receive us, whether taken by accident or design, was well selected. It is one of the highest points in that section, and commanded all the ground in the range." Pemberton was unaware that one of the three Union columns was moving along the Jackson Road against his unprotected left flank on Champion Hill. Pemberton posted Brig. Gen. Stephen D. Lee's Alabama brigade on Champion Hill where they could watch for a Union column reported moving on the crossroads. Lee soon spotted the Union troops and they in turn saw him. If the enemy force was not stopped, it would cut the Confederates off from their