The 20th New York Cavalry Regiment lost 5 enlisted men killed or mortally wounded and 2 officers and 125 enlisted men to disease during the Civil War.

1863
Organized at Sackett’s Harbor, N.Y.
September 3 Companies A to G mustered in
September 4 Company H mustered in
September 17 Companies I and K
September 22 Company L mustered in
September 23 Company M mustered in
September 30 Left State for Washington, D.C.
October and November Moved to Portsmouth, Va., by Detachments and attached to United States Forces, Portsmouth, Va., Dept. of Virginia and North Carolina
November Duty in the Defenses of Portsmouth, Va.
1864
January Attached to Heckman’s Division, 18th Army Corps, Dept. of Virginia and North Carolina
February 1 Action at Smithfield, Va.
February 20 Suffolk
April Attached to Defenses of Portsmouth, Va., Dept. of Virginia and North Carolina
May Attached to District of Eastern Virginia, Dept. of Virginia and North Carolina
June 6 Chuckatuck
June 24 Wood’s Mills Hill
July 3 South Quay
July 27-August 4 Expedition from Suffolk into North Carolina
July 29 Winston, N. C.
August 12 Guiam’s Ford, N. C.
September 3 Jamestown Island
October 15-17 Expedition from Bermuda Mills to Murfrees Depot, N. C. (Companies D, I & K)
October 16 Blackwater
December to April
Before Petersburg and Richmond

Attached to 1st Brigade, Kautz’s Cavalry Division, Dept. of Virginia and North Carolina

Company D at Fort Pocohontas attached to Separate Brigade, Defenses of Bermuda Hundred, Va., Army of the James

Company F at Fort Powhatan attached to Separate Brigade, Defenses of Bermuda Hundred, Va,

December 6-10 Expedition from Portsmouth to Hertford, N. C. (Detachment)
December 11-19 Operations about Broadwater River and Chowan River
1865
January 13 Darbytown Road
March Company G attached to 1st Brigade, McKenzie’s Cavalry Division, Army of the James

Company I with Provisional Division, Army of the James

April 1-9
Appomattox Campaign

(Companies G and I) Attached to Cavalry Brigade, Dept. of Virginia

April 1
Battle of Five Forks
April 2 Fall of Petersburg
April 3-4 Deep Creek
April 6 Rice’s Station
April 7 Burke’s Station
April 9
Appomattox Court House

Surrender of Lee and his army.

April-July Duty in the Dept. of Virginia
July 31 Mustered out and honorably discharged from service.