Looking for Perryman and Rainwater of TN and KY

William Riley Perryman was born abt. 1830 in North Carolina. He married Rebecca Rainwater in Sevier County, TN and then moved with his family and mother, Nancy, to Hickman County, KY. He joined the Union Army in IL and died at Ft. Pickering, TN. I am at a dead end. His father was suppose to be Jacob Perryman and was a successful farmer in Sevier County. His mother's maiden name might be Anderson. I am stuck on Rebecca Rainwater also although I know her father lived in Sevier County and she had a sister, Louisa C. Rainwater.