The 126th New York Infantry Regiment lost 16 officers and 137 enlisted men killed or mortally wounded and 1 officer and 122 enlisted men to disease during the Civil War.

It is honored by a monument at Gettysburg.

1863
Organized at Geneva, N.Y. by Colonel Eliakim Sherrill
August 22 Mustered in at Troy, N.Y.
September 2 Left State for Baltimore, Md., then moved to Martinsburg, Va.
September 11-12 Retreat to Harper’s Ferry, Attached to Miles’ Command, Harper’s Ferry
September 12-15 Defense of Harper’s Ferry
September 12-13
Maryland Heights

16 men were killed and 42 wounded

September 14-15 Bolivar Heights
September 15 Regiment surrendered
September 16 Paroled and sent to Annapolis, Md.; then to Camp Douglas, Chicago, Ill., and duty there guarding prisoners until November.
November 22 Declared exchanged
November 23-25 Moved to Washington, D. C. Camp at Arlington Heights, Va. Defenses of Washington
December 3 At Centreville, Va. attached to 3rd Brigade, Casey’s Division, Defenses of Washington, D.C.
1863
February Attached to 3rd Brigade, Casey’s Division. 22nd Army Corps
April Attached to 3rd Brigade, Abercrombie’s Division, 22nd Army Corps
June 25 Ordered to join Army of the Potomac in the field attached to 3rd Brigade, 3rd Division, 2nd Army Corps
June 25-July 24 Gettysburg Campaign
July 1-3
Battle of Gettysburg

The regiment was commanded by Colonel Eliakim Sherrill until he took command of the brigade on July 2. Lieutenant Colonel James M. Bull then took command of the regiment. Sherrill was then mortally wounded on July 3.

From the monument:

The regiment was in position two hundred yards at the left, July 2 until 7 p.m., when the brigade was conducted thirteen hundred yards farther to the left and the regiment with the 111th N.Y. and 125th N.Y., charged the enemy in the swale, near the source of Plum Run, driving them there from and advancing one hundred and seventy five yards beyond, towards the emmitsburg Road, to a position indicated by a monument on Sickles Avenue. At dark the regiment returned to near its former position. In the afternoon of July 3rd it took this position and assisted in repulsing the charge of the enemy, capturing three stands of colors and many prisoners.

Number engaged, 30 officers, 425 enlisted men, total engaged 455. Killed, 5 officers, 35 enlisted men. Wounded, 9 officers 172 enlisted men. Missing, 10 enlisted men. Total losses, 231.

July 5-24 Pursuit of Lee to Manassas Gap, Va.
August-October Duty on line of the Rappahannock and Rapidan
September 13-17 Advance from the Rappahannock to the Rapidan
October 9-22
Bristoe Campaign

The regiment lost 6 killed, 33 wounded and 10 missing, suffering the heavies loss of any regiment in the campaign.

October 14 Auburn and Bristoe
November 7-8 Advance to line of the Rappahannock
November 8 Brandy Station
November 26-December 2 Mine Run Campaign
December Duty near Brandy Station, Va.
1864
February 6-7 Demonstration on the Rapidan
February 6-7 Morton’s Ford
March Attached to 3rd Brigade, 1st Division, 2nd Army Corps
May 3-June 15 Campaign from the Rapidan to the James. Of the remaining strength of less than 300 men, 100 were detailed as headuarters and provost guard.
May 5-7
Battle of the Wilderness

The regiment lost 5 killed, 62 wounded, and 9 missing.

May 10-21
Spottsylvania Court House

The regiment lost 6 killed, 37 wounded and 7 missing from May 10-21

May 10 Po River
May 12 Assault on the Salient, “Bloody Angle”
May 23-26 North Anna River
May 26-28 On line of the Pamunkey
May 28-31 Totopotomoy
June 1-12 Cold Harbor. Attached to Consolidated Brigade, 1st Division, 2nd Army Corps
June 16-18 Before Petersburg; Siege of Petersburg begins
June 22-23 Jerusalem Plank Road, Weldon Railroad
July 27-29 Demonstration north of James River
July 27-28 Deep Bottom
August 13-20 Demonstration north of James River
August 14-18 Strawberry Plains, Deep Bottom
August 25 Ream’s Station
November Attached to 3rd Brigade, 1st Division, 2nd Army Corps
December 9-10 Reconnaissance to Hatcher’s Run
December 25 Consolidated into a battalion of five companies, A-E.
1865
February 5-7 Dabney’s Mills
March 25 Watkins’ House
March 28-April 9 Appomattox Campaign
March 29-30 On line of Hatcher’s and Gravelly Runs
March 31 White Oak Road
April 2 Sutherland Station and fall of Petersburg
April 3-9 Pursuit of Lee
April 6 Deatonville Road, Sailor’s Creek
April 7 High Bridge and Farmville
April 9 Appomattox Court House. Surrender of Lee and his army.
April At Burkesville
May 2-12 Moved to Washington, D.C.
May 23 Grand Review
June 3 Mustered out under Colonel Ira Smith Brown. Veterans and Recruits transferred to 4th New York Heavy Artillery.