Raids down the Susquehanna River reached the Wyoming Valley of Pennsylvania with the capture of Forts Freeland and Wallace by a force of Butler's Rangers, Indians, and men of the King's Regiment. These intrusions forced more and more troops to be diverted from the main American army to defend the frontier. Besides Allan W. Eckert has anyone penned worthy writings about this aspect of the F/I War?
I just posted reference to two F&I books in another thread but William R. Nester also has a separate book on the frontier war during the revolution. He should have info on Butler's incursions to Wyoming Valley in at least one of the volumes.