The 123rd New York lost 6 officers and 66 enlisted men killed and mortally wounded and 95 enlisted men to disease during the Civil War.

It is honored by a monument at Gettysburg.

1862
Recruited in Washington County and organized at Salem, N.Y.
September 4 Mustered in for three years service under Colonel Archibald L. McDougall, Lt. Colonel Franklin Norton and Major James C. Rogers
September 5 Left State for Washington, D.C.
September Duty in the Defenses of Washington, D.C. attached to 2nd Brigade, 1st Division, 12th Army Corps, Army of the Potomac
September 29 At Frederick, Md., and Sandy Hook
December 10-14 Moved to support of Burnside at Fredericksburg, Va.
December At Stafford Court House
1863
January 20-24 “Mud March”
February-April At Stafford Court House
April 27-May 6 Chancellorsville Campaign. Assigned to 1st Brigade, 1st Division, 12th Army Corps, Army of the Potomac
May 1-5
Battle of Chancellorsville

The regiment lost Lt. Colonel Norton, 1 other officer and 31 enlisted men killed or mortally wounded, Captain Norman Weer, Lieutenants Jerome Rice and Albert Shiland and 96 enlisted men wounded, and 16 enlisted men captured or missing

May 12 Lt. Colonel Norton died of his Chancellorsville wound at Washington. Major Rogers promoted to lieutenant colonel
May 17 Captain Adolphus Tanner of Company C promoted to major
June 11-July 24 Gettysburg Campaign
July 1-3
Battle of Gettysburg

The regiment was commanded at Gettysburg by Lieutenant Colonel James C. Rogers. It brought 495 men to the field, losing 3 enlisted men killed, Captain Norman Weer mortally wounded, 9 enlisted men wounded and First Lieutenant Marcus Beadle captured on reconnoissance.

From the monument:

July 1: Marched from Littlestown; Formed line of battle on Wolf Hill; Bivouaced near Baltimore Pike

July 2: Advanced to this line and built a heavy breastwork of logs. At about 6 p.m. moved to support the left near Little Round Top; Returning in the night found works in possession of enemy, as no troops were left to occupy them.

July 3, at about 11 a.m. made a charge and recovered these works; about 4 p.m. moved to support line then repelling Pickett’s Charge; a little later had a sharp skirmish in front of this line; at night repelled an attack with heavy loss to the enemy.

July 4, made reconnaissance around Wolf Hill and through Gettysburg over the Hanover Road.

July 5-24 Pursuit of Lee to Manassas Gap, Va.
August-September Duty on line of the Rappahannock
September 24
October 4
Moved to Bealeton Station, Va., thence to Stevenson, Ala., transferred to the Army of the Cumberland
October Guard duty along Nashville & Chattanooga Railroad

1864

March 16 Action near Tullahoma, Tenn.
May 1-
September 8
Atlanta Campaign. Attached to 1st Brigade, 1st Division, 20th Army Corps, Army of the Cumberland
May 8-11 Operations against Rocky Faced Ridge
May 14-15
Battle of Resaca

The regiment lost 4 enlisted men killed or mortally wounded and 1 officer and 5 enlisted men wounded

May 19
Near Cassville

The regiment lost 1 enlisted man wounded and 1 missing or captured

May 22-25 Advance on Dallas
May 25 New Hope Church
May 26-June 5
Battles about Dallas, New Hope Church and Allatoona Hills

The regiment lost Colonel McDougall and 4 enlisted men killed or mortally wounded and Major Tanner officer and 17 enlisted men wounded

June 10-July 2
Operations about Marietta and against Kenesaw Mountain

The regiment lost 1 officer and 13 enlisted men killed or mortally wounded, 3 officers and 34 enlisted men wounded and 17 enlisted men missing

June 11-14 Pine Hill
June 15-17 Lost Mountain
June 15 Gilgal or Golgotha Church
June 17 Muddy Creek
June 19 Noyes’ Creek
June 22 Kolb’s Farm
June 27 Assault on Kenesaw Mountain
July 1 Lt. Colonel Ambrose Stevens of the 46th New York Infantry transferred and promoted to colonel of the 123rd.
July 4 Ruff’s Station, Smyrna Camp Ground
July 5-17 Chattahoochie River
July 19-20
Peach Tree Creek

The regiment lost 2 officers and 14 enlisted men killed or mortally wounded, 2 officers and 35 enlisted men wounded

July 22-August 25
Siege of Atlanta

The regiment lost 1 enlisted man killed and Captain Henry Gray and 3 enlisted men wounded

August 26-September 2 Operations at Chattahoochie River Bridge
September 2-
November 15
Occupation of Atlanta
November 15-December 10 March to the sea
December 10-21 Siege of Savannah
1863
January to April Campaign of the Carolinas
February 19 – 20 Colonel Stevens mustered out at the end of his three years service. Lt. Colonel Rogers promoted to colonel, Major Tanner to lieutenant colonel and Captain Henry Gray to major
March 2 Thompson’s Creek, near Chesterfield Court House, S.C., and near Cheraw
March 16 Averysboro, N. C.
March 19-21 Battle of Bentonville
March 24 Occupation of Goldsboro
April 14 Occupation of Raleigh
April 26 Bennett’s House. Surrender of Johnston and his army.
April 29-May 20 March to Washington, D.C., via Richmond, Va.
May 24 Grand Review
June 8 Mustered out under Colonel Rogers, Lieutenant Colonel Tanner and Major Gray. Veterans and Recruits transferred to 60th New York Infantry