Isaac L. Thomas

Residence was not listed;
Enlisted on 8/19/1862 at Lee, VA as a Private.
On 8/19/1862 he mustered into "B" Co. VA 25th Cavalry
(date and method of discharge not given)
He was listed as:
* Detailed 9/17/1864 (place not stated) (Detailed for horse for 30 days)
* AWOL 10/17/1864 (place not stated)
* Returned 12/15/1864 (place not stated)
* Paroled 4/29/1865 (place not stated)
Promotions:
* Corpl 10/30/1863
(Alive in Texas in 1921)

Sources used by Historical Data Systems, Inc.:
- The Virginia Regimental Histories Series

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Isaac L. Thomas, Private, Capt. S. P. Larmer's Company, Trigg's Battalion Partisan Rangers*, enlisted August 19, 1862 in Hancock County, Va. by S. P. Larmer for 3 years, value of horse $150, on detached service with Lt. Young from April 24, 1863, "One short Springfield musket captured on 5 Oct. 1863," promoted 4th Corporal October 30, 1863, on April 30, 1864 his muster roll entry contains the entry, "1 Cat. Box worn out in service," promoted 3rd Corporal September 1, 1864, on 30 day horse detail September 17, 1864, recorded December 31, 1864 as "Absent without leave since 17 Oct. '64," paroled at Cumberland Gap, April 29, 1865, resident of Lee County, Virginia**

* This company was successively designated as Captain S. P. Larmer's Company, Trigg's Battalion Partisan Ranges; Company H, 27th Battalion Virginia Mounted Rifles; and Company B, 25th Regiment Virginia Cavalry. Designation was changed to the 25th Regiment Virginia Cavalry July 8, 1864.

** He later returned to the regiment as his Captain Samuel P. Larmer, and Lt. Robert D. Young, along with a number of others, were also paroled April 29 at Cumberland Gap, Ky.

I suspect that they turned themselves in to Federal troops soon after disbanding in April.

M324: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Virginia

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25th Regiment, Virginia Cavalry

25th Cavalry Regiment was organized in July, 1864, using the 27th Battalion Virginia Partisan Rangers as its nucleus. Serving in McCausland's and Imboden's Brigade, the unit fought in numerous engagements in western Virginia and the Shenandoah Valley. During April, 1865, it disbanded. Its commanders were Colonel Warren M. Hopkins, Lieutenant Colonel Henry A. Edmundson, and Major Sylvester R. McConnell.

Predecessor unit:

27th Battalion Partisan Rangers was formed in September, 1862, with seven companies, later increased to nine. The unit served in General Hodge's and W.E. Jones' Brigade and participated in various engagements in East Tennessee and western Virginia. During April, 1864, it contained 240 effectives, and in July it merged into the 25th Regiment Virginia Cavalry. Lieutenant Colonel Henry A. Edmundson was in command.
http://www.civilwar.nps.gov/cwss/regiments.cfm

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There was an Isaac L. Thomas who filed a Texas pension application, #A-45387 from Hall County, Texas