18th Regiment, New York National Guard
Mustered in: July 3, 1863
Mustered out: August 15, 1863
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 the counties of Putnam and Westchester, furnished in 1861 one company each to the 9th, 17th and 38th Volunteers
June 18, 1863, it was ordered to Harrisburg, Pa., and, commanded by Col. James Ryder, left the State (four companies), July 3, 1863; was mustered in the United States service for thirty days at Baltimore, Md., July 8, 1863; served there and at Frederick, in the 2d Separate Brigade, Middle Department, 8th Corps, and was mustered out at New York city August 15, 1863.
In 1864 a detachment of the regiment served with and as part of the 15th Militia in New York harbor for thirty days.
In its service in 1863, the regiment lost by death, of disease, two enlisted men.