1861 |
April 23 |
Ordered to Washington D.C. |
May 3 |
Order revoked with the regiment in transit in New Yok City. |
May 7 |
Nine companies allowed to proceed to Annapolis under Colonel George Pratt, Lieutenant Colonel Hiram Schoonmaker and Major Theodore Gates |
May 11 |
Mustered into three months United States service at Annapolis, efective from April 23. |
May-July |
Duty at Annapolis and Baltimore and guarding the railroad |
August 2 |
Mustered out at Kingston, New York |
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August-September |
Re-organized for three years service at Kingston, New York under Colonel Pratt, Lieutenant Colonel Hiram Schoonmaker and Major Theodore Gates |
September 20 - October 20 |
Mustered in |
October 26 |
Left State for Washington, D.C. |
Novemb er - March |
Duty at Upton's Hill, Defenses of Washington, D.C. |
December 7 |
Designated 80th New York Infantry and attached to Wadsworth's Brigade, McDowell's Division, Army of the Potomac |
1862 |
March |
Attached to Patrick's 2nd Brigade, 3rd Division, 1st Army Corps, Army of the Potomac |
March 10-15 |
Advance on Manassas, Va. |
April 4-19 |
McDowell's advance on Falmouth, Va. attached to 2nd Brigade, King's Division, Dept. of the Rappahannock |
April-May |
Occupation of Fredericksburg |
May 26-29 |
McDowell's advance on Richmond |
June-August |
Duty at Fredericksburg attached to 3rd Brigade, 1st Division, 3rd Corps, Pope's Army of Virginia |
August 16-September 2 |
Pope's Campaign in Northern Virginia |
August 20-23 |
Fords of the Rappahannock |
August 20 |
Beverly Ford |
August 26 |
Sulphur Springs |
August 28 |
Battle of Gainesville |
August 29 |
Battle of Groveton |
August 30 |
Battle of Bull Run
The regiment lost 1 officer and 30 men killed, 3 officers and 18 men mortally wounded, 6 officers and 138 men wounded, and 2 officers and 73 men missing, including Colonel Pratt, who was mortally wounded. |
September 1 |
Battle of Chantilly |
September 6-22 |
Maryland Campaign. Atatched to 3rd Brigade, 1st Division, 1st Army Corps, Army of the Potomac |
September 14 |
Battle of South Mountain |
September 16-17 |
Battle of Antietam
Commanded by Lieutenant Colonel Theodore B. Gates. The regiment lost 1 officer and 6 men killed, and 3 officers and 37 men wounded. |
September-
October |
At Sharpsburg, Md. |
October 20-November 19 |
Movement to Falmouth, Va. |
December 12-15 |
Battle of Fredericksburg
The regiment lost 2 men killed or mortally wounded, and 2 officers and 15 men wounded. |
December 20 |
Duty at Hall's Landing |
1863 |
January 7 |
Provost Guard duty at Aquia Creek and along Richmond and Fredericksburg & Potomac Railroad attached to Patrick's Command, Provost Guard, Army of the Potomac |
May 24 |
Three years men from the 35th New York transfer to the regiment. |
June 27 |
Relieved and ordered to join 1st Brigade, 3rd Division, 1st Army Corps |
July 1-3 |
Battle of Gettysburg
The regiment was commanded at Gettysburg by Colonel Theodore B. Gates. It brought 375 men to the field and lost 35 killed, 111 wounded and 24 missing out of 287 engaged.
From the monument: "Held substantially this position from about 12m. July 1st 1863 to 4 p.m. July 2nd on Cemetery Hill in support of 3rd Corps. July 3rd in front line of battle resisting Pickett's attack."
From the marker: "From a position south of this point the 20th New York State Militia delivered a most destructive fire into the attacking southerners' right flank. As the enemy infantry moved obliquely to the left, the New York Regiment advanced north along this line firing as they moved to the right. Occupying a new position near the copse of trees the Ulster Guard fought to repel Longstreet's assault, finally charging a group of Confederates, driving them from the shelter of the slashing.
Major Walter A. Van Rensselaer was wounded near the slashing in a successful attempt to capture an enemy battle-flag.
Captain Ambrose N. Baldwin Co, K was mortally wounded in the final action near the Copse of Trees."
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July 16 |
Provost Guard duty, Army of the Potomac |
October 9-22 |
Participated in the Bristoe Campaign |
September |
Colonel Gates mustered out at the end of his term of service. Lieutenant Colonel Jacob Hardenberg was promoted to colonel and command of the regiment. |
November 7-8 |
Advance to line of the Rappahannock |
November 26-December 2 |
Mine Run Campaign |
1864 |
May 3-June 15 |
Campaign from the Rapidan to the James |
May 5-7 |
Battle of the Wilderness |
May 8-12 |
Spottsylvania |
May 12-21 |
Spottsylvania Court House |
May 23-26 |
North Anna River |
May 26-28 |
On line of the Pamunkey |
May 28-31 |
Totopotomoy |
June 1-12 |
Cold Harbor |
June 16-18 |
Before Petersburg; Siege operations against Petersburg and Richmond begin |
June 18 |
Assigned to garrison and guard duty at City Point, Va., Provost Guard, Headquarters of the Army of the Potomac |
November |
Company I joined the regiment |
1865 |
March |
Assigned to Independent Brigade, 9th Army Corps |
April 2 |
Assault on and fall of Petersburg |
April 3 |
Occupation of Petersburg |
April 14 |
Provost duty at Richmond assigned to Dept. of Virginia |
November 27 |
At Norfolk and Portsmouth, Va. |
1866 |
January 29 |
Mustered out under Colonel Jacob B. Hardenberg |
