Army of the Mississippi
The first army was created on February 23, 1862. It was commanded by Major general John Pope. Pope's orders were to clear Confederate troops along the Mississippi River so the Union army could move through the area. On February 28, 1862, General Pope began to move against New Madrid, Missouri. The Army then fought at the Battle of Island Number Ten. The army next fought at the Siege of Corinth. After the capture of Corinth Pope was sent east to command the Army of Virginia. Major general William S. Rosecrans assumed command of the Army of the Mississippi. The army fought at the Battle of Iuka followed by the Second Battle of Corinth. His commanding officer, Ulysses S. Grant, was unhappy with his failure to go after the retreating Confederates after the Battle of Corinth. In October, 1862, Rosecrans was transferred to command the Army of the Ohio and the Army of the Mississippi was disbanded.