I am also looking for information regarding my great, great, great (1810-1880) and great, great (1842 - ?) grandfathers, both named Peter Croghan. I have confirmed that my great, great, great grandfather was naturalized in Charleston, SC in 1847. Perhaps they are related and arrived together? Please let me know if you have any information and I will do the same. Thanks so much. Mary Catherine Mott