Armstrong Cemetery dates from around 1790.
Location: 1504 Holston River Road. The cemetery is located within a triangle formed by Holston River Road, John Sevier Highway and Jim Armstrong Road, in the northern part of the triangle. It's across the Holston River from Holston Hills Country Club.
Source info: Robert McGinnis database of cemeteries.
The website FindAGrave.com has a page for the Armstrong Cemetery. There are 83 interments listed, of which the oldest is for Lieutenant Robert Armstrong. On the site, there is a picture of Armstrong's grave marker, which also includes his wife, Margaret Cunningham Armstrong. Robert was born in 1731 (the website says in Ireland) and died on February 28, 1796. Margaret was born in 1745 and died in 1837. The website for the Daughters of the American Revolution says that Robert was an officer in South Carolina during the Revolutionary War. On the linked page for the DAR, you can search him by entering his last and first name, and then his ancestor number, which is A003156.