Thomas Jonathan "Stonewall" Jackson (January 21, 1824 – May 10, 1863) was a Confederate general during the American Civil War, and the best-known Confederate commander after General Robert E. Lee. His military career includes the Valley Campaign of 1862 and his service as a corps commander in the Army of Northern Virginia, under Robert E. Lee. Confederate pickets accidentally shot him at the Battle of Chancellorsville on May 2, 1863. The general survived but lost an arm to amputation; he died of complications from pneumonia eight days later. His death was a severe setback for the Confederacy, affecting not only its military prospects, but also the morale of its army and of the general public. Jackson in death became an icon of Southern heroism and commitment, and became a mainstay in the pantheon of the "Lost Cause".