There were a group of Irish settlers near Clarksville, Pike County in the time shortly before and after the Civil War. The Cole family from near Castlerea, County Roscommon, lived on the Mackey plantation. In 1869 many of these families left Pike County in a wagon train for Bon Homme, Dakota Territory, now South Dakota. I'd be interested in hearing from anyone who has any information on the colony. Cole, Cogan, McCormick and Mulleague were some of the names of the families.