Siege of Jackson

Jackson Expedition
Part of the American Civil War
Siege of Jackson, Mississippi, July 10–16, 1863
Date July 5–25, 1863 Location Near Jackson, Mississippi Result Union victory
Belligerents
United States (Union)	CSA (Confederacy)
Commanders and leaders
William Tecumseh Sherman	Joseph E. Johnston
Strength
40,000	30,000
Casualties and losses
100 killed 800 wounded 100 missing	71 killed 504 wounded 764 missing

The Jackson Expedition occurred in the aftermath of the surrender of Vicksburg, Mississippi in July 1863. Union Maj. Gen. William Tecumseh Sherman led the expedition to clear General Joseph E. Johnston's relief effort from the Vicksburg area. The mission was successful and helped ensure that the Mississippi River remained in Union possession for the remainder of the war.

In the Vicksburg Campaign, one of the intermediate battles was the Battle of Jackson on May 14, 1863, in which Maj. Gen. Ulysses S. Grant's Army of the Tennessee captured the capital city of Jackson, Mississippi, but then evacuated it to move west toward Vicksburg. During the Siege of Vicksburg Johnston had been gathering troops at Jackson, intending to relieve pressure on Lt. Gen. John C. Pemberton's beleaguered garrison. Johnston cautiously advanced his 30,000 soldiers toward the rear of Grant's army surrounding Vicksburg. In response, Grant ordered Sherman to deal with Johnston's threat.

By July 1, 1863, Johnston's force was in position along the Big Black River. Sherman used the newly arrived IX Corps to counter this threat. On July 5, the day after the surrender of Vicksburg was made official, Sherman was free to move against Johnston. Johnston hastily withdrew his force across the Big Black River and Champion's Hill battlefields with Sherman in pursuit. Sherman had with him the IX Corps, XV Corps, XIII Corps, and a detachment of the XVI Corps.

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