Army of the Cumberland developed from the Army of the Ohio, commanded by General Don Carlos Buell, October 24, 1862, and was placed under the command of Major-General W. S. Rosecranz; it was also organized at the same time as the Fourteenth Corps. In January, 1863, it was divided into three corps, the Fourteenth, Twentieth and Twenty-first; in September, 1863, the Twentieth and Twenty-first Corps were consolidated into the Fourth Corps. October, 1863, General George H. Thomas took command of the army, and the Eleventh and Twelfth Corps were added to it. In January, 1864, the Eleventh and Twelfth Corps were consolidated and known as the Twentieth Corps. Army of the Tennessee was originally the Army of the District of Western Tennessee, fighting as such at Shiloh, Tennessee. It became the Army of the Tennessee upon the concentration of troops at Pittsburg Landing, under General Halleck; and when the Department of the Tennessee was formed, October 16, 1862, the troops serving therein were placed under the command of Major-General U. S. Grant. October 24, 1862, the troops in this Department were organized as the Thirteenth Corps; December 18, 1862, they were divided into the Thirteenth, Fifteenth, Sixteenth and Seventeenth Corps. October 27, 1863, Major-General William T. Sherman was appointed to the command of this army; March 12, 1864, Major-General J. B. McPherson succeeded him; July 30, 1864, McPherson having been killed, Major-General O. O. Howard was placed in command, and May 19, 1865, Major-General John A. Logan succeeded him. Army of the Mississippi began operations on the Mississippi River in Spring, 1862; before Corinth, Mississippi, in May, 1862; Iuka and Corinth, Mississippi, in September and October, 1862. Army of the Gulf operated at Siege of Port Hudson, Louisiana, May, June, and July, 1863. Army of the James consisted of the Tenth and Eighteenth Corps and Cavalry, Major-General Butler commanding and operating in conjunction with Army of the Potomac. Army of West Virginia was active at Cloyd's Mountain, May 9 and 10, 1864. Army of the Middle Military Division operated at Opepuan and Cedar Creek, September and October, 1864. During the year 1862, Brady's men followed these legions. Both armies were maneuvering to strike a decisive blow at the National Capital of either foe--one aiming at Washington and the other at Richmond. The scenes enacted in these campaigns are remarkable in military strategy, and Brady's men succeeded in perpetuating nearly every important event. Cameras were also hurried to the far South and West where great leaders with great soldiers were doing great things. Several of these cameras arrived in time to bear witness to the bravery of the men of the Mississippi, who were waging battle along the greatest waterway in North America--the stronghold of the Confederacy and the control of the inland commerce of the Continent.