I am sure you probably know this but there are a long line of Fleet Coopers in Mississippi which intermarried quite a bit with the Maxwells. I have Fleet Cooper Jr's son William Cooper moved to Lawrence Co., Mississippi about 1810 and his son born 1799 was another Fleet Cooper who married Martha M Maxwell. You can find them on the 1850 census for Lawrence Co. Mississippi (family 471). This is not my direct line, so I have not gone further.