[source: regimental orders book]
[Apparently, he should not have been promoted; see letter, Sinex to Marvin, 15 December 1863]
Head Quarters 91st Regt P.V.
December 11th 1863
Special Order No 112
Sergeant John Hamill Co D is hereby promoted to the 1st Sergeancy of that Company and will be obeyed and respected accordingly
By Order of
Jos H Sinex
Lt Col. Comding
Howard W Shipley
Lieut and Act. Adjt