The 125th Regiment lost 15 officers and 112 enlisted men killed and mortally wounded and 1 officer and 112 enlisted men by disease during the Civil War.

The regiment ishonored by a monument at Gettysburg.

1862
Organized at Troy, N.Y.
August 29 Mustered in under Colonel George Willard, Lieutenant Colonel Levin Crandell, and Major James Bush
August 31 Left State for Baltimore, Md.
September 2 Moved to Martinsburg, Va.
September 11-12 Retreat to Harper’s Ferry and attached to Miles’ Command, Harper’s Ferry
September 12-15 Defense of Harper’s Ferry
September 12-13 Maryland Heights
September 14-15 Bolivar Heights
September 15 Surrendered with the garrison
September 16 Paroled and sent to Annapolis, Md., thence to Camp Douglas, Chicago, Ill., and duty there guarding prisoners
November 22 Declared exchanged
November 23-25 Moved to Washington, D.C.
November 26 Camp at Arlington Heights, Va.; Attached to 3rd Brigade, Casey’s Division, Defenses of Washington
December At Centreville, Va.
1863
February Attached to 3rd Brigade, Abercrombie’s Division, 22nd Army Corps, Dept. of Washington
June 25, 1863 Ordered to join Army of the Potomac in the field attached to 3rd Brigade, 3rd, Division, 2nd Army Corps, Army of the Potomac
June 25-July 24 Gettysburg Campaign
July 2-4
Battle of Gettysburg

The regiment was commanded by Lieutenant Colonel Levin Crandell while Colonel George L. Willard commanded the brigade. Colonel Willard was killed in action leading a charge on July 3. A monument marks the place where Willard fell.

From the monument:

July 2, 1863, Regiment in line at the stone wall until 7 p.m. when the Brigade went to the support of the Third Corps, charged and drove back Barksdale’s Mississippi Brigade. Return at 8:30 p.m.

July 3, 1863, Regiment in front on line of the stone wall west side of Hancock Avenue at time of Longstreet’s Assault.

Number engaged, 500; killed, 26; wounded, 104; missing, 9; total, 139.

July 5-24 Pursuit of Lee to Manassas Gap, Va. Lieutenant Colonel Crandall was promoted to Colonel and command of the regiment.
August Duty on lines of the Rappahannock.and Rapidan
September 13-17 Advance from the Rappahannock to the Rapidan
October 9-22 Bristoe Campaign
October 14 Auburn and Bristoe
November 7-8 Advance to line of the Rappahannock
November 26-December 2 Mine Run Campaign
December Duty near Brandy Station
1864
February 6-7 Demonstration on the Rapidan
March Attached to 3rd Brigade, 1st Division, 2nd Army Corps
May 3-June 15 Campaign from the Rapidan to the James
May 5-7 Battles of the Wilderness
May 8-12 Spottsylvania
May 10 Po River
May 12-21 Spottsylvania Court House
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
June 16 Before Petersburg. Attached to Consolidated Brigade, 1st Division, 2nd Army Corps
June 22-23 Jerusalem Plank Road, Weldon Railroad
July 27-29 Demonstration on north side of the James
July 27-28 Deep Bottom
August 13-20 Demonstration north side of the James
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
1865
February 5-7 Dabney’s Mills, Hatcher’s Run
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 Sailor’s Creek
April 7 High Bridge and Farmville
April 9 Appomattox Court House. Surrender of Lee and his army.
May 2-12 Moved to Washington, D.C.
May 23 Grand Review
June 5 Mustered out at Alexandria, Va. under Colonel Joseph Hyde. Veterans and Recruits transferred to 4th New York Heavy Artillery.