Thomas Jonathan "Stonewall" Jackson (January 21, 1824 – May 10, 1863) was a Confederate general during the American Civil War, considered one of the best-known Confederate commanders, after Robert E. Lee. He played a prominent role in nearly all military engagements in the Eastern Theater of the war until his death, and had a key part in winning many significant battles. 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 at West Point and graduated in the class of 1846. He served in the U.S. Army during the Mexican–American War of 1846–1848 and distinguished himself at Chapultepec. From 1851 to 1861, he taught at the Virginia Military Institute, where he was unpopular with his students. When Virginia seceded from the Union in May 1861 after the attack on Fort Sumter, Jackson joined the Confederate 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 Elliott Bee Jr. compared him to a "stone wall", which became his enduring nickname. He performed exceptionally well in the campaigns in the Shenandoah Valley in 1862. Despite an initial defeat due largely to faulty intelligence, through swift and careful maneuvers Jackson was able to defeat three separate Union armies and prevent them from reinforcing General George B. McClellan's Army of the Potomac in its campaign against Richmond. Jackson then quickly moved his three divisions to reinforce General Lee's Army of Northern Virginia in defense of Richmond. He performed poorly in the Seven Days Battles against McClellan's Army of the Potomac, as he was frequently late arriving on the field. During the Northern Virginia Campaign that summer, Jackson's troops captured and destroyed an important supply depot for General John Pope's Army of Virginia, and then withstood repeated assaults from Pope's troops at the Second Battle of Bull Run. Jackson's troops played a prominent role in September's Maryland Campaign, capturing the town of Harpers Ferry, a strategic location, and providing a defense of the Confederate Army's left at Antietam. At Fredericksburg in December, Jackson's corps buckled, but ultimately beat back an assault by the Union Army under Major General Ambrose Burnside. In late April and early May 1863, faced with a