The 11th New York Cavalry Regiment lost 1 officer and 22 enlisted men killed or mortally wounded and 2 officers and 319 enlisted men to disease during the Civil War.

1861
December – May Organized at New York City under Colonel James B. Swain.
1862
May 5 Ten companies left the state for Washington, D.C. for duty in the defences of that city attached to Military District of Washington and 22nd Army Corps, Dept. of Washington.
June 18 Action at Blue Ridge Mountain, Va
August &
September
Companies L&M mustered in
October Companies L&M join regiment
December 14 Poolesville, Md.
1863
June 27
Fairfax Court House, Va.

Companies B and C under Major S. Pierre Remington attacked what they thought were a band of Moseby’s partisans. But it was the advance guard of Stuart’s three brigades of cavalry riding toward Pennsylvania. Major Remington and 18 men escaped, Four enlisted men were killed, Captain Alexander Campbell and 20 enlisted men were seriously wounded and captured, and Lieutenants Dagwell, Hazleton and Holmes and 54 unwounded or lightly wounded enlisted men were captured. Although Major Remington’s command was almost wiped out, his attack delayed Stuart’s march for half a day.

June 30 Bolivar Heights
July 7 Harper’s Ferry
July 14 Near Harper’s Ferry
July 15 Halltown
August 27 Edwards’ Ferry, Md. (Detachment)
August 20-
September 2
Company F – Expedition from Leesburg
September 22 Rockville, Md.
1864
March Ordered to Dept. of the Gulf and duty in the District of LaFourche, La.
May 15 Action at New River, La.
June Attached to District of Baton Rouge, La., Dept. of the Gulf
June 10, July 20 Manning’s Plantation
July 31 Orange Grove, near Donaldsonville
August 5 Doyall’s Plantation and Donaldsonville
August Attached to 2nd Brigade, Cavalry Division, Dept. of the Gulf
October 5-9 Expedition from Baton Rouge, La., to Clinton, Greensburg, Osyka and Camp Moore
October 5 Bayou Sara
November 14-21 Lee’s Expedition from Baton Rouge to Brookhaven, Miss., and skirmishes
November 15 Brookhaven, Miss.
November 21 Near Jackson
November 23 Clinton
November 24 Liberty, Miss.
November 27 – December 13 Davidson’s Expedition from Baton Rouge, La., against Mobile & Ohio Railroad
November 27 Franklinsville
December 22 The steamship North America sank off the coast of Florida, drowning many men of the regiment
December 27 Ocean Springs
1865
February Ordered to Memphis, Tenn. and attached to 2nd Brigade, Cavalry Division, District of West Tennessee
March 3-11 Expedition from Memphis, Tenn., into Northern Mississippi
March 28, April 18 Germantown
March-September Duty at Memphis, Tenn., and in District of West Tennessee
July 21, 1865 Consolidated to a Battalion
September 30 Mustered out at Memphis, Tenn. and honorably discharged from service.