Battle of Groveton, or Brawner’s Farm

2nd Battle of Bull Run

The regiment was commanded by Colonel Pratt. It 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. Colonel Pratt was mortally wounded, and Lieutenant Colonel Theodore B. Gates took over the regiment.

The regiment is featured on a trailside marker along the Unfinished Railroad on the Bull Run battlefield.

Battle of Chantilly

Battle of South Mountain

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.

There are three markers for Patrick’s Brigade on the Antietam battlefield. The first marker is on the east side of Mansfield Avenue near its intersection with the Hagerstown Pike. From the marker:

On the night of September 16, 1862, Patrick’s Brigade of Doubleday’s Division bivouacked in line of battle on the east side of this road, facing west.

This tablet marks the left of the brigade line, which extended northerly about 320 yards, through a triangular strip of woods.

The second marker is on the east side of Maryland Route 65, north of Starke Avenue. From the marker:

(September 17, 1862.)

Patrick’s Brigade formed line north of Joseph Poffenberger’s at 5:30 A. M. and advanced on the east of the Hagerstwon Pike in support of Gibbon’s Brigade. It crossed the Pike and entered the West Woods at this point. The 80th New York was sent to support Battery B, 4th U. S. Artillery, 130 yards south of Miller’s barn, and the 23rd moved into the field west of this point. The 21st and 35th, in close support of Gibbon’s right, swept through the West Woods and open ground east of them in the direction of the Dunkard Church, being rejoined on the way by the 23rd. The three Regiments were checked and obliged to fall back to the cover of Miller’s barn and the rocky ledges south and west of it. After an interval of nearly an hour the three Regiments again advanced in support of Goodrich’s Brigade, Twelfth Corps, but were compelled to fall back. After the repulse of Sedgwick’s Division, the Brigade was withdrawn to a position east of the Pike in support of the Artillery of the First Corps.

The third marker is on the north side of Starke Avenue. From the marker:

(September 17, 1862.)

Early in the morning of the 17th, Patrick’s Brigade advanced through the North Woods and fields east of the Hagerstown Pike and into Miller’s Cornfield in support of Gibbon’s Brigade. When Gibbon’s right deployed on the plateau and in the woods west of the Pike, Patrick crossed the Pike 230 yards north of this and entered the West Woods in support, the 80th New York was withdrawn to support Battery B, 4th U. S. Artillery, 130 yards south of Miller’s barn, and the 23rd was sent to check a movement of the enemy in the fields west of the West Woods. The 21st and 35th, in close support of Gibbon’s right, swept through the West Woods, swung to the left flank of the enemy while charging the Battery, driving them in the direction of the Dunkard Church and east of the Pike. Rejoined by the 23rd, the line advanced to the Pike but was forced back to this ledge which was held until attacked on the right flank, when it was compelled to retire to the cover of Miller’s barn and the rock ledges south and west of it.

Battle of Fredericksburg

The regiment lost 2 men killed or mortally wounded, and 2 officers and 15 men wounded.

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.

Battle of the Wilderness

Battle of Spotsylvania Court House

Cold Harbor