August was passing, and troops were pouring in from all quarters; General McClellan told me he intended to organize an army of a hundred thousand men, with one hundred field-batteries, and I still hoped he would come on our side of the Potomac, pitch his tent, and prepare for real hard work, but his headquarters still remained in a house in Washington City.  I then thought, and still think, that was a fatal mistake.  His choice as general-in-chief at the time was fully justified by his high reputation in the army and country, and, if he then had any political views or ambition, I surely did not suspect it.

About the middle of August I got a note from Brigadier-General Robert Anderson, asking me to come and see him at his room at Willard’s Hotel.  I rode over and found him in conversation with several gentlemen, and he explained to me that events in Kentucky were approaching a crisis; that the Legislature was in session, and ready, as soon as properly backed by the General Government, to take open sides for the Union cause; that he was offered the command of the Department of the Cumberland, to embrace Kentucky, Tennessee, etc., and that he wanted help, and that the President had offered to allow him to select out of the new brigadiers four of his own choice.  I had been a lieutenant in Captain Anderson’s company, at Fort Moultrie, from 1843 to 1846, and he explained that he wanted me as his right hand.  He also indicated George H. Thomas, D. C. Buell, and Burnside, as the other three.  Of course, I always wanted to go West, and was perfectly willing to go with Anderson, especially in a subordinate capacity:  We agreed to call on the President on a subsequent day, to talk with him about it, and we did.  It hardly seems probable that Mr. Lincoln should have come to Willard’s Hotel to meet us, but my impression is that he did, and that General Anderson had some difficulty in prevailing on him to appoint George H. Thomas, a native of Virginia, to be brigadier-general, because so many Southern officers, had already played false; but I was still more emphatic in my indorsement of him by reason of my talk with him at the time he crossed the Potomac with Patterson’s army, when Mr. Lincoln promised to appoint him and to assign him to duty with General Anderson.  In this interview with Mr. Lincoln, I also explained to him my extreme desire to serve in a subordinate capacity, and in no event to be left in a superior command.  He promised me this with promptness, making the jocular remark that his chief trouble was to find places for the too many generals who wanted to be at the head of affairs, to command armies, etc.

The official order is dated: 

[Special Order No. 114.]
Headquarters of the army
Washington, August 24, 1881.

The following assignment is made of the general officers of the volunteer service, whose appointment was announced in General Orders No. 82, from the War Department