In reseaching my GGG grandfather I found that his original regiment, 10th TN CSA, was eventually rolled into the 4th Consolidated Regiment TN Infantry on 9 APR 1865. It looks like they were surrendered in Greensboro, NC later that month. I have been trying to find more details about this regiment, particularly if there was a roster or a list of those soldiers. Do those exist or were soldiers only pardoned/paroled as a regiment?
The 10th Tennessee, aka the 10th Tennessee Irish, was formed in Nashville in 1862 from the large Irish population of the state capitol. It saw service with distinction at Fort Donelson, Raymond, Jackson, Chickamauga, Chattanooga, Resaca, & Jonesborough. By Jonesborough the regiment had been reduced to 51 officers & men present for duty. The regiment lost three of its colonels during the war: Adolphus Heiman, who commanded at Fort Donelson, died of illness during his and the regiment's internment; Randall MacGavock, killed leading the regiment and the 30th Tennessee (temporarily consolidated at the time) at Raymond, Mississippi; and William "Battling Bill" Grace, killed at Jonesborough.
After Jonesborough, the regiment barely existed, and was consolidated with the other Tennessee units of Thomas Benton Smith's Brigade during the Franklin-Nashville Campaign. After fighting at Spring Hill, Franklin, Murfreesboro and Nashville, the Tennessee contingent was reduced to just 65 riflemen. What few survivors of the regiment (likely a mere squad by this point) fought at Bentonville, before being consolidated into the 4th Tennessee Consolidated Infantry Regiment in April 1865, alongside the remnants of Palmer's & Quarles' Tennessee Brigades.
I'd recommend reading Ed Gleason's
Rebel Sons of Erin, a history of the regiment, on the Internet Archive.