James Longstreet (January 8, 1821 – January 2, 1904) was a Confederate general during the American Civil War and was the principal subordinate to General Robert E. Lee, who called him his "Old War Horse". He served under Lee as a corps commander for most of the battles fought by the Army of Northern Virginia in the Eastern Theater, and briefly with Braxton Bragg in the Army of Tennessee in the Western Theater.
After graduating from the United States Military Academy at West Point, Longstreet served in the United States Army during the Mexican–American War. He was wounded at the Battle of Chapultepec, and during recovery married his first wife, Louise Garland. Throughout the 1850s, he served on frontier duty in the American Southwest. In June 1861, Longstreet resigned his U.S. Army commission and joined the Confederate Army. He commanded Confederate troops during an early victory at Blackburn's Ford in July and played a minor role at the First Battle of Bull Run.
Longstreet made significant contributions to most major Confederate victories, primarily in the Eastern Theater as one of Robert E. Lee's chief subordinates in the Army of Northern Virginia.