The 155th New York Infantry Regiment lost 9 officers and 105 enlisted men killed or mortally wounded and 2 officers and 71 enlisted men to disease during the Civil War.

1862
Organized at New York City under Colonel William McEvily and Lieutenant Colonel James McMAhon
November 10 Left State for Newport News, Va.
November 18 Mustered in at Newport News, Va. Attached to Newport News, Va., Dept. of Virginia. Adjutant Hugh Flood promoted to major.
December At Suffolk, Va., attached to Corcoran’s Brigade, Division at Suffolk, Va., 7th Army Corps, Dept. of Virginia
1863
January 8-10 Expedition toward Blackwater
January 30
Action at Deserted House

The regiment lost 2 enlisted men wounded and 3 missing

March 27 Major Hugh promoted to lieutenant colonel and Captain John Byrne of Company I promoted to major
April Attached to 3rd Brigade, 1st Division, 7th Army Corps
April 12-May 4
Siege of Suffolk

Captain John McNally and 4 enlisted men were wounded

April 15 Edenton Road and Nansemond
April 24 Edenton Road
April 27 Lieutenant Colonel McMahon discharged for promotion to colonel of the 164th New York Infantry Regiment.
May 3 Providence Church Road, Nansemond River
May 4 Siege of Suffolk raised
June 12-18 Expedition to Blackwater
June 16 Carrsville
June 17 Blackwater
June 24-July 7 Dix’s Peninsula Campaign
July 10 Moved to Washington, D.C. and duty in the Defenses of that city and guard duty on Orange & Alexandria Railroad. Attached to Corcoran’s Brigade, King’s Division, 22nd Army Corps, Defenses of Washington
November Attached to 1st Brigade, Corcoran’s Division, 22nd Army Corps
November 3 Colonel McEvily discharged
December Attached to 2nd Brigade, Tyler’s Division, 22nd Army Corps
December 15 & 17
Actions at Sangster’s Station

The regiment lost 3 enlisted men wounded and 9 missing

1864
May Ordered to join Army of the Potomac in the field attached to 4th Brigade, 2nd Division, 2nd Army Corps
May 17-June 15 Rapidan Campaign
May 17-21
Spotsylvania Court House

The regiment lost 16 enlisted men killed or mortally wounded, Lt. Colonel Flood, Major Byrne, Captain John O’Dwyer and 38 enlisted men wounded, and 2 men missing

May 23-26 North Anna River
May 26-28 On line of the Pamunkey
May 28-31
Totopotomoy

The regiment lost 2 enlisted men wounded

June 1-12
Cold Harbor

Captain William Schuyler, Lieutenant Richard Dunphy and 50 enlisted men were killed or mortally wounded, Captains Dennis Carolin and Hugh Mooney, Lieutenant Hugh Duffy and 103 enlisted men wounded, and 5 men missing

June Assigned to 2nd Brigade, 2nd Division, 2nd Army Corps
June 16-18
Assault on Petersburg

Captain Thomas Hart, Lieutenants John Nolan and Michael O’Connell and 25 enlisted were men killed or mortally wounded and 11 enlisted men wounded

June 16
Siege of Petersburg begins

The regiment lost 6 enlisted men killed or mortally wounded and 11 enlisted men missing during the nine months of the siege exclusive of those listed below

June 22-23
Jerusalem Plank Road, Weldon Railroad

Lieutenant Albert Dwight and 1 enlisted man were killed

July 27-29 Demonstration north of the James
July 27-28 Deep Bottom
August 13-20 Demonstration north of the James
August 14-18
Strawberry Plains, Deep Bottom

The regment lost 4 enlisted men wounded

August 25
Ream’s Station

Captain Edward Pelouze and 4 enlisted men were killed or mortally wounded, Captain James McConvey and 3 enlisted men wounded, and Major Byrne, Captains McConvey and Francis Page, Lieutenants John Davis, Walter Hartford and George Quinn and 32 enlisted men captured

October 3 Lieutenant Philip Cronin was mortally wounded at Petersburg. He died on the 6th in the field hospital at City Point.
October 13 Lieutenant Colonel Flood discharged for disability due to his Spottsylvania wound.
October 16 Lieutenant John Davis killed by Confederate prison guard at Salisbury, North Carolina
October 27-28
Boydton Plank Road, Hatcher’s Run

Captain Daniel Purdy and 2 enlisted men were killed or mortally wounded, 4 enlisted men were wounded, and 13 men missing

1865
January 12 Major Byrne promoted to lieutenant colonel
February 5-7 Dabney’s Mills, Hatcher’s Run
February 16 Captain James McConvey of Company K promoted to major
March 25
Watkins’ House

The regiment lost 1 enlisted man mortally wounded and 11 wounded

March 28-April 9 Appomattox Campaign
March 29-31 Boydton Road and White Oak Ridge
March 30 Lt. Colonel Byrne promoted to colonel but not mustered
March 31 Crow’s House
April 2 Fall of Petersburg
April 3-9 Pursuit of Lee
April 6 Sailor’s Creek
April 7 High Bridge, Farmville
April 9
Appomattox Court House

Surrender of Lee and his army.

April At Burkesville
May 2-12 March to Washington
May 15 Major McConvey discharged
May 23 Grand Review
June-July Duty at Washington
June 15 Captain Francis Page of Company C promoted to major
July 15 Mustered out near Washington under Colonel Byrne and Major Page