Another resource for finding military history for the State of New York is The Annual Report of the Adjutant General. The year's happenings are included in the reports, which were sent to the Legislature.
Reports for the following years can currently be read online at Archive.org free:
1864 - Part 1 [Link]
1868 [Link] Officers commissioned in the Volunteer regiments from 1861-1865
1895 [Link] - Registers of the First and Second Veteran Cavalry and the First and Second Mounted Rifles
1897 [Link] - Registers of the 70th and 80th Artillery in the War of the Rebellion
1901 [Link] - Registers of the 75th, 76th, 77th, 78th, 79th and 80th Regiments of Infantry
1903 [Link] - Registers of the 114th, 115th, 116th, 117th, 118th, 120th Regiments of Infantry
If you find reports for other years, please share in the comments below!