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 for General Buell.  I answered him frankly, telling him of my understanding with General Grant, and that I was still awaiting the expected order of the War Department, assigning General Buell to my command.  Colonel Fry, as General Buell’s special friend, replied that he was very anxious that I should make specific application for the services of General Buell by name, and inquired what I proposed to offer him.  To this I answered that, after the agreement with General Grant that he would notify me from Washington, I could not with propriety press the matter, but if General Buell should be assigned to me specifically I was prepared to assign him to command all the troops on the Mississippi River from Cairo to Natchez, comprising about three divisions, or the equivalent of a corps d’armee.  General Grant never afterward communicated to me on the subject at all; and I inferred that Mr. Stanton, who was notoriously vindictive in his prejudices, would not consent to the employment of these high officers.  General Buell, toward the close of the war, published a bitter political letter, aimed at General Grant, reflecting on his general management of the war, and stated that both Generals Canby and Sherman had offered him a subordinate command, which he had declined because he had once outranked us.  This was not true as to me, or Canby either, I think, for both General Canby and I ranked him at West Point and in the old army, and he (General Buell) was only superior to us in the date of his commission as major-general, for a short period in 1862.  This newspaper communication, though aimed at General Grant, reacted on himself, for it closed his military career.  General Crittenden afterward obtained authority for service, and I offered him a division, but he declined it for the reason, as I understood it, that he had at one time commanded a corps.  He is now in the United States service, commanding the Seventeenth Infantry.  General McCook obtained a command under General Canby, in the Department of the Gulf, where he rendered good service, and he is also in the regular service, lieutenant-colonel Tenth Infantry.