The 109th New York Infantry Regiment lost 5 officers and 160 enlisted men killed or mortally wounded and 164 enlisted men to disease during the Civil War.

1862
Organized at Binghampton
August 27 Mustered in under Colone Benjamin Tracy, Lieutenant Colonel Isaac S. Chatlin and Major Philo B. Stilson
August 30 Left State for Annapolis, Md.
September Guard railroad from Annapolis Junction, Md., to Washington, D.C., and garrison duty in the Defenses of Washington attached to 8th Army Corps, Middle Department
October Attached to Railroad Guard, 22nd Army Corps, Dept. of Washington
1864
April Attached to 1st Brigade, 3rd Division, 9th Army Corps, Army of the Potomac
May 3-June 15 Campaign from the Rapidan to the James
May 5-7
Battle of the Wilderness

The regiment lost 11 killed, 64 wounded and 1 missing in the Wilderness and 14 killed, 32 wounded and 2 missing at Parker’s Store Road

May 8-21
Spotsylvania Court House

The regiment lost 25 killed, 86 wounded and 29 missing from May 8-21

May 12
Assault on the Salient

Second Lieutenant Daniel Barton was killed

May 20 Colonel Tracey resigned, eventually becoming commandant of the infamous Elmira Prison. Lieutenant Colonel Catlin took command of the regiment
May 23-26 North Anna River
May 23-24 Ox Ford
May 26-28 On line of the Pamunkey
May 28-31
Totopotomoy

The regiment lost 2 killed, 22 wounded and 1 missing including Captain John Gorman, who was killed

June 1-12
Cold Harbor

The regiment lost 25 killed, 81 wounded and 20 missing during the twelve days of fighting around

June 1-3 Bethesda Church
June 16-18
First Assault onĀ Petersburg; Siege of Petersburg begins

Captain William Warwick was killed in action and Second Lieutenant E. C. Jones mortally wounded

July 29 Lieutenant Colonel Issac Catlin is promoted to colonel, Major Philo B. Stilson promoted to lieutenant colonel, and George Dunn promoted to major.
July 30
Mine Explosion, Petersburg

The regiment lost 11 killed, 24 wounded and 18 missing, including First Lieutenant N. J. Griswold, who was killed

August 18-21
Weldon Railroad

The regiment lost 7 killed, 12 wounde and 1 missing

August 25 Ream’s Station
August 31 Second Lieutenant Gilbert D. Craft was cashiered from the regiment
September Attached to 1st Brigade, 1st Division, 9th Army Corps
September 29-October 2 Poplar Springs Church, Peeble’s Farm
October 8 Reconnaissance on Vaughan and Squirrel Level Roads
October 27-28 Boydton Plank Road, Hatcher’s Run
November 25 Second Lieutenant James Tunison was dismissed from the regiment
December 7-11 Warren’s Raid on the Weldon Railroad
1865
March 8 Major Dunn discharged and replaced by Major Zelotus G. Gordon
March 25 Fort Stedman
March 28-April 9 Appomattox Campaign
April 2 Assault on and fall of Petersburg
April 2 Occupation of Petersburg
April 3-9 Pursuit of Lee
April 9 Surrender of Lee and his army at Appomattox Court House
April 22-27 Moved to Washington, D.C.
May 23 Grand Review
June 4 Mustered out at Delaney House in Washington. Veterans and Recruits transferred to 51st New York Infantry.