Russell, I'm not descended from Pesnell, but Pesnell does intersectwith 3 of my lines, Gaines, Harris and Gann, and I have put in a long study in order to prove my Harris Grandmother (which I have accomplished) so am able to sharewhat I have though may be little. John R. Pesnell b. 1832 is probably buried in a Confederate Cemetery somewhere around the place he died in1862 would be , Grenada, Mississippi. Not sure which county that's in. He died of disease.
How did you arrive as Thompson for the maiden name of Margaret? Just curious.