William F. Fox, Lt. Col. U. S. V., Regimental Losses in the American Civil War, 1861-1865: A Treatise on the extent and nature of the mortuary losses in the Union regiments, with full and exhaustive statistics compiled from the official records on file in the state military bureaus and at Washington

Eightieth New York Infantry--“Ulster Guard.”

Total of killed and wounded, 439; captured and missing, 144; died in Confederate prisons (previously included), 22.

Present, also, at Beverly Ford; Gainesville; Groveton; Wilderness; Spotsylvania; North Anna; Totopotomoy; Cold Harbor; Appomattox.

notes.--This regiment was from Ulster county, and was better known as the Twentieth, it having served in the State Militia for several years under that number. Although known officially as the Eightieth Infantry, it never accepted that designation, but adhered faithfully to its old militia number. Colonel Pratt, who commanded it before the war also, was a gentleman of wealth, education, and a member of the State Senate. He was killed at Manassas. At that battle the regiment was in Patrick's Brigade, Hatch's Division, and lost 32 killed, 165 wounded, and 82 missing; total, 279. At Antietam its casualties were 6 killed, 40 wounded, and 8 missing; total, 54. It distinguished itself particularly at Gettysburg by the prominent part which it took in the repulse of Pickett's charge. The regiment was then in Rowley's (1st) Brigade, Doubleday's Division; but during the battle of the third day, a part of the brigade, including the Twentieth, was under the command of Colonel Gates; its loss at Gettysburg was 35 killed, 111 wounded, and 24 missing; total, 170. In July, 1863, the regiment was detached from its corps and ordered to report to General Patrick, the Provost Marshal of the army, for duty in his department. It remained on provost-duty at General Headquarters until the final assault on Petersburg, when it joined the assaulting column and lost several in killed and wounded. The Twentieth served first as a three months regiment, leaving Kingston, April 28, 1861, and was stationed at Annapolis Junction, and at Baltimore. It reorganized under a three years enlistment, and left the State again, October 25, 1861. After a short stay at Washington, it crossed into Virginia, November 7, 1861, and joined Wadsworth's Brigade, going into winter quarters at Upton's Hill. The regiment was continued in service until January 29, 1866.