20th New York State Militia Regiment
| 80th Regiment New York Volunteer Infantry | |
|---|---|
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|
| Active | April 23-May 11, 1861 (mustered in) to August 2, 1861 (three months' militia service), then September 20-October 20, 1861 (mustered in) to January 29, 1866 |
| Country |
 United States
|
| Allegiance | Union |
| Branch | Infantry |
| Engagements |
Battle of Hatteras Inlet Batteries Second Battle of Bull Run Battle of Chantilly Battle of South Mountain Battle of Antietam Battle of Fredericksburg Battle of Gettysburg Mine Run Campaign Battle of the Wilderness Battle of Spotsylvania Court House Battle of North Anna Battle of Totopotomoy Creek Battle of Cold Harbor Siege of Petersburg |
| Insignia | |
| 3rd Division, I Corps |  |
| 1st Division, I Corps |  |
The 80th New York Volunteer Infantry Regiment, the "Twentieth New York State Militia", "Ulster Guard", was an infantry regiment of the Union Army during the American Civil War.
On the return of the 20th New York State Militia Regiment from its three months' service, Col. George W. Pratt reorganized it at Kingston, New York as a regiment of volunteers, and it was mustered in the service of the United States for three years between September 20 and October 20, 1861. December 7, 1861, it received its State numerical designation, and May 24, 1863, the three years' men of the 35th New York Volunteer Infantry Regiment. November 6, 1864, a new company joined the regiment.
The companies were recruited principally in Ulster County; men from neighboring counties also joined the regiment.
The regiment left the State October 26, 1861; served in Wadsworth's Brigade from October, 1861; in Irvin McDowell's Division, Army of Potomac, from November, 1861; in 2d Brigade, McDowell's Division, Army of Potomac, from January, 1862; in Marsena R. Patrick's, 1st, Brigade, King's, 3d, Division, 1st Corps, Army of Potomac, from March, 1862; in 2d Brigade, same division, Department of the Rappahannock, from May, 1862; in 3d Brigade, 1st Division, 3d Corps, Army of Virginia, from June, 1862; in same brigade and division, 1st Corps, Army of Potomac, from September 12, 1862; in Patrick's Provost Guard Brigade, Army of Potomac, from January 7, 1863; in 1st Brigade, 3d Division, 1st Corps, Army of Potomac, from June, 1863; in Provost Guard Brigade, Army of Potomac, from July 16, 1863; in the Independent Brigade, 9th Corps, Army of Potomac, from March, 1865; on provost duty at City Point, Virginia, from April 7, 1865; at Richmond, Virginia, from April 22, 1865; at Norfolk, Virginia, from November 27, 1865; and it was honorably discharged and mustered out, under Col. Jacob B. Hardenbergh, January 29, 1866, at Portsmouth, Virginia.
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