William M. Smith was a soldier of the American Revolution from North Carolina. He is mentioned by Lucian Lamar Knight on page 489 of Georgia's Landmarks, Memorials and Legends (published 1914):
From an obscure grave in the county [Coweta] the remains of William Smith, another soldier of the first war for independence, were brought to Newnan some time ago and re-interred in the Confederate burial-ground, in the southeast corner of Oak Hill. He was given the sobriquet of "Hell Nation", a somewhat descriptive title which may indicate the fiery quality of his valor. Mr. Smith died at the age of 81. He enlisted in Moore County, N.C., and was granted a pension on September 3, 1832.I visited the final, final resting place of Mr. Smith in October of last year. When putting an image of the stone with the history by Mr. Knight, I noticed a bit of an issue. The older military stone for Mr. Smith, complete with a recessed shield, simply provides he was a member of Alston's N.C. Mil., Rev. War. The newer military stone adds the phrase "Continental Line" with a birth year of 1751, and a death date of 8 May 1852.
Uh Oh! There's more research to be done! ;-)