Ya, you would be reaching a bit to think that. I had to look on a map to find where Shippensburg is: You're located on the western edge of what back in the mid-1700's was the epicenter of American long rifle manufacturing, so if your gun was locally made, who knows what its history was. I very much doubt that it saw any combat in the C.W., but perhaps it was used by some old farmer who was in a home guard unit.
I'm kind of intrigued by the barrel. Its style, being hexagonal at the breach and round at the muzzle, to my eye, doesn't match with the back action percussion lock; I think the barrel is much older than the lock. I'm sure that type of a barrel has a name, but I don't know what that name is, but that style of barrel was fairly common in the 1750's. You see them on rifles, especially on trade rifles, on "smooth" rifles, and fowlers beginning around that period. A long hexagonal barrel on a rifle can be very barrel heavy, meaning the balance point for the rifle is way out on the fore stock. By removing some of the mass of the barrel by turning it from hexagonal to round, you move the balance point back closer to the lock, and that makes the rifle much more comfortable to hold or aim. That barrel could have been used on another rifle dating from the American frontier of the 1700's, the F & I War, or the American Revolution. People didn't throw things away like our modern society does, so it's not that unusual to find a barrel that's much older than the rest of the gun its mounted on. The back action percussion lock mounted on your rifle doesn't come into use before the early 1840's or so. I think there's a good possibility that your rifle was made after the 1840's from various parts of an older gun.
Let me say that by no means am I an authority on any type of gun. I'm just an old guy who's always had an interest in old guns, and I read a lot.