Looking for William and Eliza Arnold family

I am looking for the family of William and Eliza Arnold who had a son born in this county in about 1845. His name was Benjamin F. Arnold. He joined the Civil War in Clarksville Arkansas in 1863 and served in the 2nd Arkansas Infantry Regiment, Company K. His brother, James Arnold, served in the same Company and his father, William Arnold served in Company I. I would like to find the family for genealogical research. I am a gggranddaughter to William and Eliza Arnold.

Any help I can get will be greatly appreciated.