Hello,I am looking for info on ggggrandfather Joseph Gragg.Since there were several Joseph Gragg's in the census records I'm not sure if I have the right one but I think it's the one for 4th regiment,company F,Union Cavalry-Tn.He lived in Walker co,Ga in 1860 then in 1870 he lived in Marshall co,Tn and was still there in 1900 census.He was born around 1835-1840,his wife was named Hannah.Can anyone tell me any dates for his service or location?Is there any info for a pension?I have no idea when he died and haven't been able to find any grave site.He had at least four children who all lived in Marshall co,Tn all their lives.I am new at researching my family and appreciate any help,Thanks!