Joseph Eggleston Johnston was an American career army officer, serving with distinction in the United States Army during the Mexican–American War and the Seminole Wars. After Virginia seceded from the Union, he entered the Confederate States Army as one of its most senior general officers.
Johnston was trained as a civil engineer at the United States Military Academy at West Point, New York, graduating in the same class as Robert E. Lee. He served in Florida, Texas, and Kansas. By 1860 he achieved the rank of brigadier general as Quartermaster General of the U.S. Army.
Johnston's effectiveness in the American Civil War was undercut by tensions with Confederate president Jefferson Davis. Victory eluded him in most campaigns he personally commanded. He was the senior Confederate commander at the First Battle of Bull Run in July 1861, but the victory is usually credited to his subordinate, P.G.T. Beauregard. Johnston defended the Confederate capital of Richmond, Virginia, during the 1862 Peninsula Campaign, withdrawing under the pressure of Union Maj. Gen. George B. McClellan's superior force. He suffered a severe wound at the Battle of Seven Pines, and was replaced by Robert E. Lee.