Hi Ann, My Donaldsons were from Ireland and settled in Kittanning around 1790 then spread out to other communities. There is a Donaldson web site where you might get help. DONALDSON-L@rootsweb.com There were Donaldsons in Fayette Co and Washington Co, PA. I searched my files and did not find your side. I remember reading somewhere of the Donaldsons you mentioned in the Revolution. Do not remember exactly where? Sorry. Donaldson is like the name Smith in number in Scotland since it is a English corruption of McDonald. The McDonald's of Scotland was the largest clan and early businessmen of the area. However, their neighbors called them cattle thieves. John Donaldson