The 25th New York Cavalry Regiment lost 1 officer and 16 enlisted men killed or mortally wounded and 49 enlisted men to disease during the Civil War.

1864
Regiment organized at Saratoga Springs, N.Y., and at Hart’s Island, N.Y. Harbor, and mustered in by Companies as follows:
February 20 Companies A and B mustered in and moved to Washington, D.C.
March 19 Companies C and D mustered in and moved to Washington, D.C.
April Duty in the Defenses of Washington, D.C. attached to 22nd Army Corps
April 14 Company E mustered in and moved to Washington, D.C.
April 23 Company F mustered in and moved to Washington, D.C.
April 20 Company G mustered in and moved to Washington, D.C.
May 16 Company K mustered in and joined regiment
June Ordered to the field and attached to Provost Guard Army of the Potomac
July 11-12 Fort Stevens and repulse of Early’s attack on Washington
July Attached to Defenses of Washington, D.C., 22nd Corps
July 29 Company H mustered in and moved to Washington, D.C.
August 7-November 28 Sheridan’s Shenandoah Valley Campaign. Attached to 3rd Brigade, 1st Division, Cavalry Corps, Army of the Shenandoah, Middle Military Division
August 11 Toll Gate, near White Post
August 16 Cedarville, Guard Hill, or Front Royal
August 17 Winchester
August 18 Opequan Creek
August 25 Near Kearneysville
August 26 Halltown
August 27 Duffield Station
September 3 Berryville
September Attached to 1st Brigade, 1st Division, Cavalry Corps, Army of the Shenandoah
September 13 Opequan Creek
September 15 Sevler’s Ford, Opequan Creek
September 18 Company I mustered in and joined regiment
September 19
Third Battle of Winchester
September 22
Fisher’s Hill
September 23-24 Front Royal
September 24 Luray Valley
September 25 Luray
September 26-27 Port Republic
October 2 Mt. Crawford
October 8-9
Tom’s Brook (“Woodstock Races”)
October 15 Company L mustered in and joined regiment
October 20 Company M mustered in and joined regiment
October 22 Near Conrad’s Ferry
November 12 Newtown
November 22 Rude’s Hill, near Mt. Jackson
November 27-28 White Plains
November 28-December 3 Expedition into Faquier and Loudoun Counties
November 29 Upperville
November 30 Snicker’s Gap
December 19-28 Expedition to Gordonsville
December 20 Flint Hill
December 22-23 Jack’s Shop, near Gordonsville
1865
January Attached to 2nd Infantry Division, Army of West Virginia
January 19 and 29 Columbia Furnace
January-June Duty in the Shenandoah Valley
June 27 Mustered out at Hart’s Island, N.Y., and honorably discharged from service.