- Baltimore City
- Dates: 1861-1865
Notes: William Hayes appointed surgeon, Brigade US Vols (PA) Nov. 9, 1861; mustered out Jul. 27, 1865. To report to the medical director at Baltimore Jan. 20, 1863; stationed at Fort McHEnry, post surgeon and medical director 3rd Brig. Jan. 8, 1865-Jul. 1865.
Source: Records of the Adjutant General’s Office, Service Record Cards of Volunteer Surgeons, 1861-65. National Archives, Washington DC
- Dates: 1865
Notes: Stationed at Fort McHenry as surgeon, US Vols. Jan. 8, 1865-Aug. 3, 1865.
Source: Records of the Adjutant General’s Office, Records Concerning Medical Personnel 1839-1914, List of Officers Serving at Permanent Posts 1860-1893. National Archives, Washington DC, p. 223