Capt. John Boggs 2nd wife was Mary Williamson Barr a widow of Robert Barr killed by Indians at Ft. Wallace 1778 Derry, Westmoreland PA.  My branch is John Barr son of Robert Barr and Mary Williamson and Jane (Jean) Boggs daughter of Capt John Boggs and 1st wife Jane (Jean) Irwin.  Capt Boggs was also involved with the Indian attacks at Ft. Henry,Wheeling, Ohio Co., VA (later WV). Mary Williamson was a sister of Col. David Williamson who was with Lord Dunmore in 1774.  --Dr. William Lee Baran