 Complete the following phrase:  The army was formed on November 20, 1862, when General Braxton Bragg renamed the former Army of Mississippi and was divided into two corps commanded by Leonidas Polk and William J. Hardee. A third corps was formed from troops from the Department of East Tennessee and commanded by Edmund Kirby Smith; it was disbanded in early December after one of its two divisions was sent to Mississippi. The remaining division was assigned to Hardees corps while Kirby Smith returned to East Tennessee. The armys cavalry was consolidated into a single command under Joseph Wheeler. The armys first major engagement under its new name took place against the Army of the Cumberland on December 31 