Thomas Jonathan "Stonewall" Jackson (January 21, 1824 – May 10, 1863) was a Confederate general and military officer who served during the American Civil War. He played a prominent role in nearly all military engagements in the eastern theater of the war until his death. Military historians regard him as one of the most gifted tactical commanders in U.S. history.
Born in what was then part of Virginia (now in West Virginia), Jackson received an appointment to the United States Military Academy, graduating in the class of 1846. He served in the United States Army during the Mexican–American War, distinguishing himself at the Battle of Chapultepec. From 1851 to 1861, he taught at the Virginia Military Institute.
When Virginia seceded from the United States in May 1861 after the Battle of Fort Sumter, Jackson joined the Confederate States Army. He distinguished himself commanding a brigade at the First Battle of Bull Run in July, providing crucial reinforcements and beating back a fierce Union assault. Thus Barnard E. Bee compared him to a "stone wall", which became his enduring nickname.
Jackson performed exceptionally well in various campaigns over the next two years.