Thomas Jonathan "Stonewall" Jackson (January 21, 1824 - May 10, 1863) was a Confederate General during the American Civil War. Jackson is considered to be one of the most gifted tactical commanders in American history. His Valley Campaign and his envelopment of the Union Army at Chancellorsville are studied as examples of innovative and bold leadership. He excelled in the First Battle of Bull Run (where he received the nickname "Stonewall"), Second Bull Run, Antietam, and Fredericksburg. Confederate pickets accidentally shot him at the Battle of Chancellorsville on May 2, 1863 and though he survived his arm had to be amputated. He died of complications of pneumonia eight days later. His death was a severe setback for the Confederacy, not from just a military standpoint but also the morale of its army and of the general public.