This army, at times known by the name Army of the West was one of the most important in the Western Theater, fighting at Shiloh, Corinth, and Perryville. It was organized on March 5, 1862, and portions of the Army of Pensacola were added on March 13. It was consolidated with the Army of Central Kentucky and the Army of Louisiana on March 29. On November 20, 1862, it was renamed the Army of Tennessee.