According to John Alderman, Francis Marion was in the Civil War in Clark's Battalion, 30th Virginia Infantry, and was wounded in the left hip.
1860 census of Floyd Co., Virginia, Court House district, enumerated 6 Aug, lists on pp. 142-143 as family #1020/961:
Francis M. Slusher, 31, farmer; Lucinda, 34; Leroy C., 7; Sarah E., 5; Tazewell, 3; Serena A., 1; Jas B. Turman, 12. All born in Virginia.
1870 census of Floyd Co., Virginia, Jacksonville township, enumerated 20 June, records on p. 8 as family #56/54:
Slusher, Francis M., 41, farmer; Lucy, 44; Leroy C., 17; Sarah Ellen, 15; Tazwell H., 13; Serena Adaline, 11; Talitha A., 8; Thomas F., 4; Mary M., 1. All born in Virginia.
1880 census of Floyd Co., Virginia, Jacksonville district, enumerated 15 June, lists on p. 25 as family #248:
Slusher, Francis M., 51, farmer; Lucy, 54, wife; Tazewell H., 23, son; Serena A., 21, dau; Tillitha A., 18, dau; Thomas F., 14, son; Mary M., 12, dau; Dolly A., 9, dau. All born in Virginia.
1890 census of Floyd Co., VA
14 , lists in Jacksonville District:
Frances M. Slusher, 61; Lisay, 65; Tebetha A., 28; Mary M., 21; Dollie, 18.