The 20th Regiment, New York Infantry was organized at New York City May 6, 1861. It left the state for Fortress Monroe, Va., June 13. Three years men transferred to 3rd New York Battery and to Battery "F" 5th United States Artillery May 6, 1863. Regiment mustered out June 1, 1863, expiration of term.
The Regiment lost during service 8 Officers and 53 Enlisted men killed and mortally wounded and 1 Officer and 58 Enlisted men by disease. Total 120.
ASSIGNMENTS:
Attached to Fortress Monroe and Camp Hamilton, Dept. of Virginia, to May, 1862. 2nd Brigade, 1st Division, Dept. of Virginia, to June, 1862. 3rd Brigade, 2nd Division, 6th Army Corps, to May, 1863.
SERVICE:
Duty at Fortress Monroe and Camp Hamilton June 15 to August 26, 1861. Hampton, Va., August 7. Bombardment and capture of Forts Hatteras and Clarke, N. C., August 28-29. Duty at Fortress Monroe and Camp Hamilton September 13, 1861, to May 10, 1862. New Market Bridge, near Newport News, December 22, 1861. Reconnaissance to Big Bethel January 3, 1862. Tranter's Creek and occupation of Norfolk and Portsmouth May 10. Duty at Norfolk until June 9. Ordered to join Army of the Potomac in the field June 9. Seven days before Richmond June 25-July 1. Savage Station June 29. White Oak Swamp and Glendale June 30. Malvern Hill July 1. At Harrison's Landing until August 16. Movement to Fortress Monroe, thence to Centreville August 16-28. In works at Centreville August 29-31, and cover Pope's retreat to Fairfax Court House September 1. Maryland Campaign September 6-22. Crampton's Pass, South Mountain, September 14. Battle of Antietam September 16-17. At Hagerstown, Md., until October 29. Movement to Falmouth, Va., October 29-November 19. Battle of Fredericksburg, Va., December 12-15. "Mud March" January 20-24, 1863. At White Oak Church until April 27. Chancellorsville Campaign April 27-May 6. Operations at Franklin's Crossing April 29-May 2. Maryes Heights, Fredericksburg, May 3. Salem Heights May 3-4. Banks' Ford May 4.
ROSTERS:
The composite rosters of this unit contains the names of 1465 men.
Company A – Newark, New Jersey.
Company B – New York City.
Company C – New York City.
Company D – New York City, Albany County and Dutchess County.
Company E – New York City.
Company F – New York City.
Company G – Dutchess County, Monroe County, Onondaga County, New York City and in Newark, New Jersey.
Company H – Columbia County, Ulster County, New York City, Brooklyn, Kings County and The Bronx, Bronx County.
Company I – New York City.
Company K – New York City, and Brooklyn, Kings County also in New Jersey.
HISTORICAL NOTES: