99th Regiment, New York National Guard
Mustered in: August 2, 1864
Mustered out: November 9, 1864.
The following is taken from New York in the War of the Rebellion, 3rd ed. Frederick Phisterer. Albany: J. B. Lyon Company, 1912.
This regiment, not now in existence, but then located in New York city, and commanded by Col. John O'Mahoney, was mustered in the service of the United States for 100 days, August 2, 1864. It (nine companies) served at the depot, Elmira, and was mustered out of the United States service, November 9, 1864, at New York city. See 88th Volunteers.
During this service it lost by death, of disease, one officer.