In 1818, Congress passed the first of three major Revolutionary War pension acts. The act granted lifetime pensions to all men who had served as regular army soldiers in the Continental Line and who could demonstrate financial need. Prior to the passage of this act, pensions had been restricted to former soldiers who were no longer able to support themselves due to injuries sustained while in service. The second act, passed by Congress in 1820, required applicants to provide more concrete evidence of this financial need in the form of a certified inventory of his property and income. They also had to include an account of all members of the applicant's family, including their health and ability to contribute to household income. In 1832, the third act extended pension benefits to include soldiers who had served in the state troops or militia. Congress also passed a related act in 1836 granting pensions to the widows and orphans of Revolutionary War veterans.

Giles County was named for William Branch Giles, United States senator from Virginia in 1806 when the county was created from Montgomery, Monroe (now in West Virginia), and Tazewell Counties. Several subsequent additions were made from Wythe (1808), Monroe in 1829 and Mercer in 1841 (both now in West Virginia), Craig (1880), and Tazewell (1826 and 1836) Counties. The county seat is Pearisburg.