Probably either the Henry Arnold who married Matilda Emrick on 4 May 1851, or else the Henry Arnold who married Elizabeth Herring on 5 June 1851, both in Montgomery Co. (The first seems more likely since Henry's sister Frances married George Emrick, and his brother Samuel married Sarah Emrick. The other Henry who married in 1851 may have been the Henry b. 1825, son of Joseph Arnold.)