MARCH, APRIL, AND MAY, 1864.

On the 18th day of March, 1864, at Nashville, Tennessee, I relieved Lieutenant-General Grant in command of the Military Division of the Mississippi, embracing the Departments of the Ohio, Cumberland, Tennessee, and Arkansas, commanded respectively by Major-Generals Schofield, Thomas, McPherson, and Steele.  General Grant was in the act of starting East to assume command of all the armies of the United States, but more particularly to give direction in person to the Armies of the Potomac and James, operating against Richmond; and I accompanied him as far as Cincinnati on his way, to avail myself of the opportunity to discuss privately many little details incident to the contemplated changes, and of preparation for the great events then impending.  Among these was the intended assignment to duty of many officers of note and influence, who had, by the force of events, drifted into inactivity and discontent.  Among these stood prominent Generals McClellan, Burnside, and Fremont, in, the East; and Generals Buell, McCook, Negley, and Crittenden, at the West.  My understanding was that General Grant thought it wise and prudent to give all these officers appropriate commands, that would enable them to regain the influence they had lost; and, as a general reorganization of all the armies was then necessary, he directed me to keep in mind especially the claims of Generals Buell, McCook, and Crittenden, and endeavor to give them commands that would be as near their rank and dates of commission as possible; but I was to do nothing until I heard further from him on the subject, as he explained that he would have to consult the Secretary of War before making final orders.  General Buell and his officers had been subjected to a long ordeal by a court of inquiry, touching their conduct of the campaign in Tennessee and Kentucky, that resulted in the battle of Perryville, or Chaplin’s Hills, October 8,1862, and they had been substantially acquitted; and, as it was manifest that we were to have some hard fighting, we were anxious to bring into harmony every man and every officer of skill in the profession of arms.  Of these, Generals Buell and McClellan were prominent in rank, and also by reason of their fame acquired in Mexico, as well as in the earlier part of the civil war.

After my return to Nashville I addressed myself to the task of organization and preparation, which involved the general security of the vast region of the South which had been already conquered, more especially the several routes of supply and communication with the active armies at the front, and to organize a large army to move into Georgia, coincident with the advance of the Eastern armies against Richmond.  I soon received from Colonel J. B. Fry —­now of the Adjutant-General’s Department, but then at Washington in charge of the Provost-Marshal-General’s office—­a letter asking me to do something