Your man Edwin Tubbs that died 7 December 1861 at Camp Randall Madison Wisconsin, this fellow enlisted September 1861 in Company A of the 12th Wisconsin Infantry, and his residence was River Falls, which is in Pierce County Wisconsin. A quick check of the 1860 census of Pierce County Wisconsin finds Edwin Tubbs and Erissa Tubbs with a 1 year old female named Nettie Tubbs. The 1880 census of Viroqua, Vernon, Wisconsin yields a Theresa Tubbs (transcribed Teressa) with daughter Nettie 21 schoolteacher (Nettie is transcribed as Nattie), also Nellie daughter 19, also a schoolteacher, and Frank an adopted son. The Viroqua Cemetery contains a grave with a Nettie M Tubbs 24y, that is all, no dates. The location is in the older part of the cemetery. The 1890 Veterans Schedule contains a Thirza E Tubbs widow of Edwin C Tubbs and she is living at the Wisconsin Veterans Home at the time of the enumeration, which was June of 1890. These may be the folks you are looking for, none of my relation. Have fun in the hunt.