Hi, I have an Irish family that came to America in the early 1820's. By the time of the CW they were living in PA and my ancestor was working as a civil engineer. He would have been in his early 40's. My questions are: Would he have had to serve, and if he did, what unit would he have been with? The only Irish units I have found seem to be connected with New York. Any help would be appreciated. Thank you. Dianne