The Fourth New York Infantry Regiment lost 2 officers and 62 enlisted men killed or mortally wounded and 1 officer and 23 enlisted men to disease during the Civil War.

It is honored by a monument at Antietam.

1861
Organized at New York City
May 2 Companies C, D, E, F, H and K mustered in for two years United States service
May 7 Companies A and G mustered in
May 9 Companies B and I mustered in
May 15 Alfred W. Taylor mustered in as colonel, John D. McGregor as lieutenant colonel and Captain William Jameson of Company H as major
June 3 Left State for Newport News, Va. and duty there. Attached to Newport News, Va., Dept. of Virginia
July 25 Moved to Baltimore, Md. and duty there and at Havre de Grace. Attached to Dix’s Command, Baltimore, Md.
1862
June 5 Moved to Suffolk, Va., and duty there. Attached to Webber’s Brigade, Division at Suffolk, 7th Army Corps, Dept. of Virginia
July 7-8 Colonel Taylor resigns. Lieutenant Colonel McGregor promoted to colonel (but not commissioned until October 10) and Major Jameson promoted to lieutenant colonel
September 8 Ordered to join 3rd Brigade, 3rd Division, 2nd Army Corps, Army of the Potomac
September 16-17 Battle of AntietamCommanded by Lieutenant Colonel John D. McGregor.

From the monument:

Killed at Antietam, Sept. 17, 1862

Co. A Color Sergt. A. Biering, Private John Byrnes, Private J. Corcoran, Private W. McManus;

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

Lieutenants Lewis Eagleston, Edward Knoske, William Seton and William Wheeler were wounded.

September 22 Moved to Harper’s Ferry, W. Va. and duty there
October 14 Captain Charles N. Kruger od Company D promoted to major
October 16-17 Reconnaissance to Charlestown
October 30-November 17 Advance up Loudoun Valley and movement to Falmouth, Va.
December 12-15 Battle of FredericksburgThe regiment lost 13 enlisted men killed or mortally wounded, Colonel McGregor, Lieutenants William Savage and Willliam Scriber and 49 enlisted men wounded, and 6 men missing.
1863
January 20-24 “Mud March”, then at Falmouth
April 27-May 6 Chancellorsville Campaign
May 1-5 Battle of ChancellorsvilleThe regiment elected to stay on past the expiration of its enliistement until the battle was done
May 25 Mustered out under Colonel McGregor, Lieutenant Colonel Jameson and Major Kruger