Cashtown, maybe ten miles away to the west, where Heth’s Confederates were coming from. Take the old road towards Chambersberg from there, that’s the route Lee took coming in. Along the highway from Chambersburg maybe three miles west of Gettysburg look for the “first shot” marker just N of the road adjacent to a old 19 th Century two-story house.
Greencastle PA worth a look, next stop south of Chambersburg down the Interstate, where the citizens defied the whole ANV to save some local Black Freedmen. Further south and west - Harpers Ferry.
Antietam/Shapsburg are within long day trip range, same thing foes for Valley Forge.