The trans-Mississippi movement proved abortive.
My eldest son, who had accompanied me on the Vicksburg campaign and siege, had while there contracted disease, which grew worse, until he had grown so dangerously ill that on the 24th of January I obtained permission to go to St.Louis, where he was staying at the time, to see him, hardly expecting to find him alive on my arrival.

While I was permitted to go, I was not permitted to turn over my command to any one else, but was directed to keep the headquarters with me and to communicate regularly with all parts of my division and with Washington, just as though I had remained at Nashville.
When I obtained this leave I was at Chattanooga, having gone there again to make preparations to have the troops of Thomas in the southern part of Tennessee co-operate with Sherman's movement in Mississippi.

I directed Thomas, and Logan who was at Scottsboro, Alabama, to keep up a threatening movement to the south against J.E.Johnston, who had again relieved Bragg, for the purpose of making him keep as many troops as possible there.
I learned through Confederate sources that Johnston had already sent two divisions in the direction of Mobile, presumably to operate against Sherman, and two more divisions to Longstreet in East Tennessee.

Seeing that Johnston had depleted in this way, I directed Thomas to send at least ten thousand men, besides Stanley's division which was already to the east, into East Tennessee, and notified Schofield, who was now in command in East Tennessee, of this movement of troops into his department and also of the reinforcements Longstreet had received.

My object was to drive Longstreet out of East Tennessee as a part of the preparations for my spring campaign.
About this time General Foster, who had been in command of the Department of the Ohio after Burnside until Schofield relieved him (*21), advised me that he thought it would be a good thing to keep Longstreet just where he was; that he was perfectly quiet in East Tennessee, and if he was forced to leave there, his whole well-equipped army would be free to go to any place where it could effect the most for their cause.