Dr. Greg, if you want to read an interesting book on Gettysburg (I assume you will be going there), there is a book by the same name authored by Newt Gingrich and William R. Forstchen. This is a "what if" account if Lee had done some things a bit different. If you have never been there, I would recommend reading this book after you have visited and seen the area. What a wonderful museum, exhibits and battlefields exist there. It is really something to read about the battle, but see the terrain and such is really quite an experience. I think we spent about five days in the area a couple of years ago.
I am enjoying your ride report.