Sorry but the first scoped rifle in the United States was during the Revolution. I've no proof it was used in combat, but the officer who ordered it knew nothing of cheek weld and had to have springs (spring loaded butt pad) installed to soften the recoil. Check out chapter 4 of my second book (it's also in the first book):
https://www.amazon.com/Sharpshooters...oters+marksmen
ETA: Found an article on it too:
https://allthingsliberty.com/2013/07...lescope-to-it/