The Army of Mississippi (also called the Confederate Army of the Mississippi) was a Confederate army during the American Civil War. It should not be confused with the Union Army of the Mississippi. It was formed on March 29, 1862.^[1] The commander was Full General Albert Sidney Johnston with Full General P. G. T. Beauregard as second-in-command.^[a][1] After Johnston's death at the Battle of Shiloh, Beauregard took over. After that there were a series of commanders. In November 1862, the Army of Mississippi was renamed the Army of Tennessee.^[4] The second army called the Army of Mississippi was created in December 1862, under Lieutenant general John C. Pemberton.^[4] This army had a confusing number of additional names. The II corps, under Major general Sterling Price was called the "Army of West Tennessee".^[5] It was also called the Army of the West.^[4] When both corps (I corps and II corps) were changed into divisions in January 1863, they dropped the name Army of Mississippi.^[4] Leonidas Polk had commanded I corps. In May 1864, Polk's troops joined with Joseph E. Johnston's Army of Tennessee to form the third Army of Mississippi.^[4] Polk was killed in June 1862 after which the army was simply called Alexander P. Stewart's corps.^[4]