The monument to the 4th New York Volunteer Infantry Regiment at Antietam is in the National Cemetery.  (National Cemetery tour map; 39°27’35.9″N 77°44’29.4″W; map location) It was dedicated in 1887.

The 4th New York was commanded at Antietam by Lieutenant Colonel John D. McGregor. Athough the monument is in the National Cemetery, the regiment fought at the Sunken Road.

4th New York Volunteer Infantry Regiment Monument at Antietam

Detail from the 4th New York Volunteer Infantry Regiment Monument at Antietam

From the monument:

4th
New York Vols.

First Scott Life Guard
3rd Brigade, 3rd Division,
2nd Corps

Mustered in Service May 4, 1861. Participated with the
Army of the Potomac in the Battles of South Mountain,
Antietam, Fredericksburg and Chancellorsville.

Killed at Antietam, Sept. 17, 1862

Co. A Color Sergt. A. Biering
Co. A Private John Byrnes
Co. A Private J. Corcoran
Co. A. Private W. McManus
Co. B. 1st Sergt. H. Pickham
Co. B. Capt. John S. Downs
Co. B. Private J. McDonald
Co. B. Private W.L. Norris
Co. B. Private John Burns
Co. C. Capt. H.K. Chapman
Co. C. Corporal H. Wolfe
Co. C. Private James Price
Co. D. Private Philip Diehl
Co. D. Private G. Frederick
Co. D. Private F.H. Hausman
Co. D. Private F. Wilbert
Co. E. Private Thomas Hickey
Co. E. Private W. McKnight
Co. F Private F. Hermann
Co. F. Private Saml. Fites
Co. G. Sergt. V.B. Carpenter
Co. G. Corp. R. Aginton
Co. G. Private Chas. Wolf
Co. G. Private M. Hines
Co. G. Private J. Stewart
Co. I Corporal E.J. Flagg
Co. I Private J. Blumenshein
Co. I Private Jas. Hunt
Co. I Private P. Riley
Co. I. Private Phil Rudden
Co. I. Private B. Gordon
Co. K. Sergt. S.T. Willetts
Co. K. Corp. Joshua Smith
Co. K. Private John Hughes
Co. K. J.H. Sharrock

Detail from the 4th New York Volunteer Infantry Regiment Monument at Antietam

See more on the history of the 4th New York Volunteer Infantry Regiment in the Civil War