Sorry, this is all there is:
J. A. Gardner, Private, Company E,* 10th (DeMoss’) Tennessee Cavalry, enlisted December 7, 1862 at Waverley, Tenn by Col. Johnson for the war, recorded on the May/June, 1863 muster roll as absent, sick, Spring Hill, last paid April 30, 1863, presence not stated at the June 30, 1863 muster, no further records
Note, there are no subsequent muster rolls for Company E in the records, hence, we cannot ascertain his subsequent service
* This company was formerly Company B, Napier’s Battalion Tennessee Cavalry.
This regiment was formed about February 25, 1863 by the consolidation of the five companies of Cox’s Battalion Tennessee Cavalry with the five companies of Napier’s Battalion Tennessee Cavalry. It was consolidated with the 11th Regiment Tennessee Cavalry in February, 1865, and was finally paroled as the 10th and 11th Regiment Tennessee Cavalry at Gainesville, Alabama, in May, 1865.
Compiled Service Records of Confederate Soldiers Who Served from the State of Tennessee
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10th Regiment, Tennessee Cavalry (DeMoss')
OVERVIEW: 10th Cavalry Regiment was organized in February, 1863, by consolidating Cox's and Napier's Tennessee Cavalry Battalions. Its companies were raised in the counties of Perry, 10th Tennessee Cavalry Regiment (DeMoss'), CSA
10th Cavalry Regiment was organized in February 1863, by consolidating Cox's and Napier's Tennessee Cavalry Battalions. Its companies were raised in the counties of Perry, Humphreys, Decatur, Hickman, Davidson, Montgomery, and Henry. The unit served in Forrest's, Humes', J.B. Bifle's, and Dibrell's Brigade. It fought at Brentwood, Denmark, and Chickamauga, then saw action in the Atlanta Campaign and Hood's operations in Tennessee. During February 1865 it was consolidated with the 11th Tennessee Cavalry Regiment and in May contained 30 officers and 280 men. The unit ended the war in Alabama and surrendered with the Department of Alabama, Mississippi, and East Louisiana. Its field officers were Colonels Nicholas N. Cox and William E. De Moss, Lieutenant Colonel Edward B. Trezevant, and Major John Minor.
http://www.larkcom.us/ancestry/civilwar/cw_cs_10th_tenessee_cavalry_regiment%20(demoss).cfm
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See also:
http://sptddog.com/sotp/10th-tenn.html