Gentlemen,
Try Company M, 8th Tennessee Cavalry (UNITED STATES).
http://www.tngenweb.org/civilwar/usacav/usa8cav.html
Respectfully,
Gerald D. Hodge, Jr
War Between the States Historian
Historian: 39th Georgia Volunteer Infantry Regiment
http://39thGAVOLINFRGT.homestead.com/39thHomepage.html