The 15th New York Engineer Regiment lost 7 enlisted men killed or mortally wounded and 3 officers and 119 enlisted men to disease during the Civil War.

There is a monument to the 15th & 50th New York Engineers at Gettysburg.

1861
October 25 Organized at Washington, D.C.. October 25, 1861, from 15th Regiment New York Infantry. Duty at Washington and Alexandria attached to Engineer Brigade, Army of the Potomac.
1862
March Moved to the Virginia Peninsula
April 5-May 4 Siege of Yorktown
May Advance up the Peninsula and constructing bridges on the Chickahominy River
June 25-July 1 Seven days before Richmond
June 27 Seven Pines
June 30 White Oak Swamp and Charles City Cross Roads
July 1 Malvern Hill
July-August At Harrison’s Landing
August 16-22 Moved to Washington, D.C.
September-October Maryland Campaign
November – June Rappahannock Campaign
December 12-15
Battle of Fredericksburg
January 20-24 “Mud March”
1863
April 27-May 6 Chancellorsville Campaign
April 29-May 2 Operations about Franklin’s Crossing
May 3 Maryes Heights, Fredericksburg
May 3-4
Salem Heights
May 4 Banks’ Ford
June 5-13 Deep Run Ravine
June 25 Mustered out. Three years men consolidated to a Battalion of three Companies, A – C.
June-July Gettysburg Campaign
July 1-3
Battle of Gettysburg
October 9-22 Bristoe Campaign
November 7-8 Advance to line of the Rappahannock
November 26-December 2 Mine Run Campaign
December 9 Company D assigned
1864
March Company E assigned
May-June Rapidan Campaign
May 5-7
Battle of the Wilderness
May 8-21
Spottsylvania Court House
May 23-26 North Anna River
May 26-28 On line of the Pamunkey
May 28-31 Totopotomoy
June 1-12
Cold Harbor
June 15 Crossing of James River
June 16-18 Before Petersburg
June 16 – April 2 Siege operations against Petersburg and Richmond
July 27-28 Deep Bottom
November Seven Companies added
1865
January 3-15 Companies A, B & H with Terry’s Expedition to Fort Fisher, N. C.,
January 15 Companies A, B & H – Capture of Fort Fisher
February 5-7 Hatcher’s Run
February 22 Companies A, B & H – Capture of Wilmington, N. C.
March 1-April 26 Companies A, B & H – Campaign of the Carolinas. Occupation of Goldsboro and Raleigh.
March 28-April 9 Appomattox Campaign
April 2-3 Fall of Petersburg and Richmond
April 3-9 Pursuit of Lee
April 9
Appomattox Court House

Surrender of Lee and his army.

April 23-29 Expedition to reinforce General Sherman
April 26 Companies A, B & H – Bennett’s House. Surrender of Johnston and his army.
May- June Companies A, B & H – Duty in Dept. of North Carolina until June
May 2-15 Moved to Washington, D.C.
May 23 Grand Review
June 13 Companies E, F, G, H, I, K, L & M mustered out at Washington, D.C
June 14 Company C mustered out
July 2 Companies A, B & D mustered out