I am the great great Grandson of an Allen M. Caulk who lived in Illinois and served in the Civil War. He may have moved to MONTH. Or Iowa after the war and then back to Illinois. My Grandmother, Doris J. Caulk (Foley) was the Granddaughter of Allen. I'm not sure if this is the same Allen M. Caulk. But I hope the info is useful; if so please contact me for more information.