I see this is an older post, so you may never see it. I wanted you to know that The Peter Hanger you are speaking of is in my family tree: My 6th great grandfather was Peter Hanger I, Peter Hanger I and II served in the Rev War and the Peter in MO that was killed there is actually Peter Adams Hanger, son of David Hanger and Sarah (Sally) Crosby.
My ancestor is Samuel Lesley Hanger, Peter Adams half-brother (2nd wife of David; Mary (Polly)Lesley, mentioned in the article as having claimed Peter after they found him. A big family that was very well known in Augusta Co VA and then some of the Hangers migrated to Mo. David was a Judge in Washington Co, Mo.
Thank you for letting me add some comments
Jo Ann Barker Bunce