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I doubt my ggg-grandfather Thomas Doggett is the same person you're inquiring about, but I suspect there's a family connection. My ggg-GF Thomas Doggett was born in Bedford Co, VA in 1775. He married Susanna Smith on Aug. 16, 1802 in Olgethorpe Co., GA; and died after 1850 in Campbell Co., GA. I have no record of military service for my ggg-GF Thomas Doggett. Furthermore, he would have been 30 years old in 1815 and by then had moved to GA and was raising a family there. My Thomas Doggett is the gg-grandson of Rev. Benjamin Doggett, the Anglican minister who immigrated from England to Lancaster Co., VA in the late 1660s.
"Thomas" was a very popular name in this branch of the Doggett family for generations. My Thomas Doggett's grandparents George Doggett and Ann Chattin (or Chatwin) of Lancaster Co., VA and later Culpepper Co., VA had three sons: Thomas, Richard (another popular name in this family), and Chattin (my lineage, and father of my ggg-GF Thomas Doggett). I have no info on either of George Doggett / Ann Chattin's sons Thomas and Richard, other than Thomas was alive in 1758 when his father George Doggett died since he's named in George Doggett's will. The will doesn't mention George's son Richard so it's likely Richard had died by 1758. It's conceivable your Thomas Doggett is a son of one of George/Ann Doggett's sons Thomas or Richard, but that's purely speculation on my part.