Hello John III,
The following is from the book Tears on the Bluestone. This work contains regimental histories and biographical sketches of the 151st Virginia Militia, as well as the Flat Top Copperheads. A photograph of Caldwell is also in the volume. See link below.
CALDWELL, GEORGE WILLIAM --- Captain, Company A, enlisted on 8/23/1861 at Jumping Branch, Mercer County, [West] Virginia --- 1860 MCC, age 31, master carpenter, married to Elizabeth A., age 25. Born on 7/1/1829 in Giles County, Virginia. Son of John and Eliza Fry Caldwell. Married to Elizabeth Ann Williams in 1851 in Giles County, Virginia. Enlisted 5/5/1862 in Mercer County in Company A, 17th Virginia Cavalry. Absent on detail as personal escort to General John Echols throughout the entire war. Paroled at Charleston, West Virginia on 6/22/1865, age 36. Appears on the 1870 Census of Mercer County, West Virginia, Plymouth Township, age 41, farmer, married to Elizabeth, age 35. Enumerated on the 1880 Census of Mercer County, West Virginia, Plymouth District, age 50, farmer, married to E. A., age 45. Listed on the 1900 Census of Mercer County, West Virginia, East River District, age 70, surveyor, married to Emma R., age 40, married for 5 years. Died on 2/9/1909 in Mercer County, West Virginia. Buried in Old Pine Grove Church Cemetery, Lerona, Summers County, West Virginia. A postwar biographical sketch states that Caldwell surveyed the Virginia-West Virginia line, as well as the line dividing Mercer and Summers Counties in West Virginia. It also says that he sometimes “sneaked home to bring food” during the war.