Fourth Army Corps: Oliver O. Howard, Commanding. HQ at Cleveland and Blue Springs, Tennessee, April 30, 1864.

Organization of Oliver O. Howard's Fourth Army Corps, April 30, 1864 (as one of the corps in the Department of the Cumberland, under Major-General George H. Thomas).

After the Battles of Chattanooga in November 1863, Union troops came into the mountains around East Tennessee. Colonel Eli Long and various divisions had set up camp in Charleston and Calhoun, Tennessee, in December 1863, later moving down to Cleveland. According to Myra Inman (from her published diary), O.O. Howard's troops were camped near Cleveland on December 13, 1863.

(William R. Snell, ed., Myra Inman: A Diary of the Civil War in East Tennessee, (1859-1866), (Macon: Mercer University Press, 2000), 234.

These next references are later, in the spring of 1864. In Official Records, it shows that some of the brigades were headquartered at Cleveland, Tennessee, and some were headquartered at nearby Blue Springs, Tennessee. This is not the same Blue Springs, Tennessee, that is in Greene County (now called Mosheim). This area was a community near Cleveland, Tennessee, known as a mineral spring or watering place. It is identified in O.R. as being between Cleveland, Tennessee, and Dalton, Georgia:

"One division (Stanley's), Fourth Corps, is stationed at Blue Springs (5 miles in advance of Cleveland, on the railroad between that place and Dalton) and at Ooltewah."

Quoted from:
Official Records, Series 1, Volume 32, In Three Parts. Part 3, Correspondence, etc., 90. https://texashistory.unt.edu/ark:/67531/metapth152650/m1/99/

FOURTH ARMY CORPS: OLIVER O. HOWARD
Headquartered at Cleveland, Tennessee, and nearby Blue Springs, Tennessee.
Partial extract of: Official Records, Ser. 1, Vol. 32, Pt. 3, 551.

FIRST DIVISION, COMMANDED BY DAVID S. STANLEY
Headquartered at Cleveland and Blue Springs, Tennessee.

First Brigade (Cleveland, Tennessee), commanded by Brigadier General Charles Cruft.

Second Brigade (Blue Springs, Tennessee), commanded by Walter C. Whitaker.

Third Brigade (Blue Springs, Tennessee), commanded by William Grose.

Artillery (Blue Springs, Tennessee), commanded by Captain Peter Simonson.


SECOND DIVISION, COMMANDED BY JOHN NEWTON
Headquartered at Cleveland, Tennessee.

First Brigade (Cleveland, Tennessee), commanded by Col. Francis T. Sherman.

Second Brigade (Cleveland, Tennessee), commanded by Gen. George D. Wagner.
 
The above divisions consist of various regiments from Illinois, Indiana, Kentucky, Ohio, Pennsylvania, and Missouri, a few of which are on furlough or just returned from furlough. These are listed specifically under the division headings. Refer to source for complete listing.

O.R., Ser. 1, Vol. 32, Pt. 3, 551.

Source Citation:

Official Records, Series 1, Volume 32, Part 3 (Correspondence, etc.), 551.

The War of the Rebellion: A Compilation of the Official Records of the Union And Confederate Armies. Series 1, Volume 32, In Three Parts. Part 3, Correspondence, etc. 

In 1864, The Fourth Army Corps (Oliver O. Howard, commanding) is under General George H. Thomas in the Department of the Cumberland.

Citation for 1863 Southeastern Tennessee Information Map:

United States Army. Department Of The Cumberland. Topographical Engineers. [Information map: Southeastern Tennessee]. [Chattanooga: Topographical Engineer Office, Head qrs., Army of the Cumberland, 1863] Map. Retrieved from the Library of Congress, https://www.loc.gov/item/2006635115/. (Accessed August 22, 2016.)

The War of the Rebellion: A Compilation of the Official Records of the Union And Confederate Armies. Series 1, Volume 32, In Three Parts. Part 3, Correspondence, etc.