US Civil War Draft Registrations Records 1863-1865942
St Mary’s County, 4th District
Hill, Thomas; Age as of 1 Jul 1863: 21; White; Occ: Farmer; Single; b: MD
St Mary’s County, 5th District
Hill, Thomas; Age as of 1 Jul 1863: 21; White; Occ: Farmer; Single; b: MD

Many Thomas Hill's in History & Roster of MD Volunteers War of 1861-1865 per http://www.lineages.com/vault/MarylandRoster.asp 4/3/2001 (MD/MD Volunteers 1861-65)

History & Roster of MD Volunteers, War of 1861-6. Index. Compiled by Martha & Bill Reamy 1990 Thomas Hill I-106, I-613, I-739, II-64, II-132 (File: Genealogy Data, Non Sources, MD) (Could this be him?)