Statistics for occurrence #1 of “Lieut. Mather” in chapter 7 of Isaac O. Best, History of the 121st New York State Infantry:

...ieth and Van Horn. Asst. Surgeon Valentine was dismissed for incompetency after trial by court martial. Captain Angus Cameron died of typhoid fever, Major Olcott was promoted to Lieut. Colonel, and Lieut. Mather and Adjutant Arnold to Captains. Cleveland J. Campbell of Cherry Valley was commissioned as Captain in the regiment, and Henry Upton as 2d Lieutenant. Lieut. Sternberg was promoted to Quartermaster...
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