“John Armstrong son of the above [Armbrose [sic] Armstrong and Mary his wife] was born Jany. 24th 1762.” [Armstrong family Bible at the Virginia State Archives, Acc. 27094]

John Armstrong was mentioned in the 28 February 1768 will of his father Ambrose Armstrong. He was to receive a year of school in addition to a share of the estate. [Essex County, Virginia, Will Book 12, pages 321–322.]

On 18 September 1820, John Armstrong and Sarah his wife who was Sarah Purkins, and Josiah Minter and Catharine his wife who was Catharine Boughan, all of the County of Essex, for the purpose of conveyance of their interest in a certain Tract of Land in the county of Buckingham, which Land the late Henry Purkins died possessed, appoint Thomas Boughan and John P. Armstrong their true and lawful attorneys. Signed John Armstrong, Sarah Armstrong, Josiah Minter, Catharine Minter. Witnesses: George his + mark Davis, John T Purkins, James his + mark Haile. [Essex County, Virginia, Deed Book 40, pages 145–146.]

On 15 January 1821, John Armstrong and Caston Boughan were bound $100 for John Armstrong’s administration of the estate of Catharine Banks. [Essex County, Virginia, Will Book 19, page 163.]

He is mentioned in the will of his brother Ellis in 1839.