"United States Revolutionary War Rolls, 1775-1783," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QL65-K5KG : 15 March 2018), James Gassaway, Mar 1779; citing Mar 1779, Virginia, United States, citing NARA microfilm publication M246. Washington D.C.: National Archives and Records Services, 1980. FHL microfilm 830,374.
"United States Revolutionary War Pension Payment Ledgers, 1818-1872," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q24Q-PHFT : accessed 15 December 2018), James Gassaway, 04 Sep 1835; citing Tuscaloosa, Alabama, United States, NARA microfilm publication T718 (Washington D.C.: National Archives and Records Administration, 1962), roll 10; FHL microfilm 1,319,390.
It may be possible to confirm family relationships with James by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with James:
Gassaway-248 and Gassaway-37 appear to represent the same person because: Same birth/death dates -- a merge has also been proposed for his mother. Please make sure that merge is completed before this one.