37th New York Infantry Regiment
The 37th New York Infantry Regiment or the Irish Rifles was formed accepted by the State on May 25, 1861, and organized in New York City. The regiment mustered in the service of the United States on June 6 and 7, 1861 for two years of service to June 22, 1863.

The 75th New York Militia formed the nucleus of the regiment. Several companies were recruited: H at Allegany, I at Ellicottsville, K at Pulaski, and all others at New York City. Men from the 101st New York Volunteer Infantry joined this regiment by transfer on December 24, 1862. An on May 25, 1863, men who had served were consolidated into two companies and these were transferred to the 40th Infantry as Companies I and K.

Service
The 37th New York had its roots in the 75th New York State Militia, organized in 1856 by John H. McCunn, colonel; James Haggerty, lieutenant colonel; and Dennis C. Minton, major. The 75th was disbanded in 1856, but was revived in April 1861 when President Abraham Lincoln issued his call to arms.

1861

After leaving the State of New York on June 23, 1861, the regiment served at and near Washington D.C. until March 1862. They camped at the foot of East Capitol Street. An incident between Colonel John H. McCunn and 1st Lieutenant Robert F. Hunter who was then serving with the provost guard. McCunn was found guilty of conduct "prejudicial to the good order and military discipline" though also directed to "resume his sword and duties. Their service continued in COL John H. McCunn's Brigade in the Army of Northeastern Virginia from July 21, 1861.

The regiment continued in Hunter's Brigade, Division of the Potomac from August 4, 1861. Next they served in Richardson's Brigade from August 22, 1861; in same brigade, Heintzelman's Division, Army of the Potomac, from October 15, 1861. The regiment participated in the First Battle of Bull Run in MGEN McDowell's reserves and went into winter quarters near Bailey's cross-roads.

1862

After several temporary assignments the regiment finally became a part of the 3d brigade, 1st division, III Corps from March 13, 1862.

The Peninsula campaign

Companies H and I had served detached from the regiment at Fort Washington, D. C., from August, 1861, to March, 1862, and rejoined the regiment in Alexandria on March 15. The regiment embarked for Fortress Monroe on Saturday, March 17, 1862. Morale was high in the army as they looked forward to the campaign, and some of the men in the 37th had smuggled whiskey aboard the transports leading to a drunken brawl with men of the 2nd Michigan that ended when the 2nd's colonel Orlando Poe, roughly sent five of the 37th's instigators below decks.The 37th was part of a movement of 121,500 men that an English observer remarked that it was the "stride of a giant." Amassing his army at Ft. Monroe, McClellan shelved his initial amphibious envelopment of Yorktown because the CSS Virginia was still in operation, and he ordered an advance up the Peninsula to begin April 4.

On April 5, the IV Corps made initial contact with Confederate defensive works at Lee's Mill, an area McClellan expected to move through without resistance. This unexpected defensive line stretched across the peninsula along the Warwick River. Taken in by a successful Rebel deception campaign by the local Rebel commander, MGEN John B. Magruder, McClellan began his siege. The 37th found themselves in the lines directly opposite Yorktown as a member of Heintzelman's III Corps. After a failed attempt to disrupt the Confederates' improvement of their fortifications at Dam No. 1, on the Warwick River near Lee's Mill, on Wednesday,  April 16, the AoP spent the remainder of April in the laborious process of transporting and placing massive siege artillery batteries, which McClellan planned to deploy on May 5. By this time, LTGEN Joseph E. Johnston and his Army of Northern Virginia were in the Yorktown fortifications. The men of the 37th had to endure frequent April rains that turned the opposing trenches to morasses of mud. Among the more dangerous duty during the siege was picket duty in advance of the main lines, rotated through the companies along the 37th's frontage.

Escaped slaves entering the 37th's corps' lines on Saturday, May 3, reported that the Rebels were sending their supply wagons in the direction of Richmond. McClellan refused to believe the intelligence because of his overestimation of the size of Rebel forces opposite him. He was convinced that Johnston's 120,000 man army would stay and fight. Saturday evening, the 37th and the other troops received a brief bombardment from the Rebel fortifications. Early Sunday morning, the 37th's corps commander, Heintzelman, ascended in one of Lowe's observation balloons and saw that the Yorktown defenses were empty.

A surprised McClellan sent cavalry after Johnston who decided to make a stand Fort Magruder, straddling the Williamsburg Road (from Yorktown), constructed earlier by Magruder. The Battle of Williamsburg was the first pitched battle of the Peninsula campaign, in which nearly 41,000 Union and 32,000 Confederates were engaged. BGEN Joseph Hooker's division, first in line of march, made first contact. It assaulted Ft Magruder, but by 15:00, was being driven back and was at the point of being overrun by MGEN  James Longstreet when they were saved by the timely arrival of BGEN Philip Kearny's 3rd Division. Kearny immediately deployed his men to Hooker's left. The 37th, being in BGEN Berry's 3rd brigade in Kearny's division, deployed on the left flank of their division with the regimental flank anchored against the marshy ground sloping down to Halfway Creek.

The battle was heavy and fought where the gun smoke combined with rain and fog to hamper visibility. There were several Rebel attempts to turn AoP's left flank. Berry had formed the 37th in loose order to extend through the woods between the farmland and the marsh. COL Hayman had further refused his line with Company B lest any rebels got through the timber and marsh. In that position, the 37th was continually engaged. Initially, the line was taken under fire from Confederate troops in the woods to their front. Soon, scouts came back from the woods reporting Rebels moving through the woods and marsh to get around the flank. Hayman shifted Companies C. F, G, I, K and  to extend Company B's refusal of the line so that when the enemy came into the open they would not be behind the regiment. The 37th quickly repulsed the Rebels first and many frequent subsequent attempts to turn the left flank. After several of these assaults, the Rebels withdrew. The four companies remaining in the original line, Companies A, D, E, and H, had spread out further, but were also successful in beating back the attacks. Overall, holding down the left flank allowed Berry, and in turn, Kearny to keep the line intact and, in turn, allowed Hooker to hold. A Confederate assault on the other end of the line against Hancock's brigade in the 2nd Division of IV Corps failed with great loss and the battle ended. Around 17:00, McClellan finally arrived on the field from his headquarters in Yorktown despite being aware of heavy fighting since 09:00.

While at Williamsburg they received a complimentary mention from General Philip Kearny for gallantry in action. Several of the company-grade officers and staff NCOs were commended by both Berry and Hayman for their performance during this action. While Hooker's division was mauled, the 37th and Kearny's division as well as Hancock's brigade at the other end of the U.S. line, acquitted themselves well. During this battle, the 37th suffered 95 killed, wounded, or found to be missing.

While McClellan reported this battle as a brilliant victory saved from defeat by his appearance on the field, it was actually a planned delaying action by Johnston who bought time for his retreating army to get back to the defenses at Richmond. McClellan, per usual, was inept when the enemy behaved differently from how he expected, and he downplayed the performance of his subordinates while puffing up his ineffective actions. Francis Palfrey, an oft-quoted officer in the 20th Massachusetts, concluded that the commanding general's late arrival at the battle marked a pattern of behavior, a reluctance to actually command in battle; he wrote, "Curiously enough, there was almost always something for McClellan to do more important than to fight his own battles."

At the Battle of Fair Oaks and in the Seven Days' battles the regiment was closely engaged, after which it went into camp at Harrison's landing; moved from there to Alexandria; was present at the battles of Bull Run and Chantilly; reached Falmouth December 6, 1862; was active at Fredericksburg with a total loss of 35 members; and encamped near Falmouth during the rest of the winter.

On December 24, 1862, the regiment received the veterans of the 101st N. Y.

1863

The heaviest loss was suffered in the Chancellorsville campaign in May, 1863, when 222 of the 37th were killed, wounded or missing. A report from Major William DeLacy recounted the actions of this encounter in detail. The regiment struck tents the morning of April 28 and marched about 6 miles toward the Rappahannock River where they encamped. They crossed the river on May 1 at about 11am. They defended a battery on the front and then to connect with the left of General Howard's command. A night attack was undertaken at around 11pm. DeLacey recounted how the regiment "Drove some troops from the rifle-pits on our right." On May 3 while the brigade was moving to the rear of the Union lines, a deadly attack on the front and left flank caused confusion and forced the regiment to fall back. The regiment was later reformed and fell back.

The three years men were transferred to the 40th N. Y. on May 29, 1863. On June 22, 1863, the regiment was mustered out at New York City under the command of COL S. B. Hayman.

Affiliations, battle honors, detailed service, and casualties

Organizational affiliation
Attached to:
 BGEN Hunter's Brigade, BGEN Heintzelman's Division, BGEN McDowell's Army of Northeast Virginia, to August to October, 1861
 BGEN Richardson's Brigade, BGEN Heintzelman's Division, Army of the Potomac (AoP), to March, 1862.
 2nd Brigade, 3rd Division, III Corps, AoP, to July, 1862.
 3rd Brigade, 3rd Division, III Corps, to July, 1862.
 3rd Brigade, 1st Division, III Corps, to June, 1863.

List of battles
The official list of battles in which the regiment bore a part:

 Blackburn's Ford
 Siege of Yorktown
 Battle of Williamsburg
 Battle of Fair Oaks
 Seven Days Battles
 Battle of Oak Grove
 Battle of Glendale
 Battle of Malvern Hill
 Battle of Groveton
 Second Battle of Bull Run
 Battle of Chantilly
 Battle of Fredericksburg
 Battle of Chancellorsville

Detailed service

1861 
 Left New York for Washington, D.C., June 19, 1861.
 Duty in the Defences of Washington, DC till March, 1862. (Cos. "H" and "I" detached as
garrison at Fort Washington August, 1861, to March, 1862.)
 Reconnaissance to Pohick Church and Occoquan October 18, 1861, and November 11, 1861

1862 
 Lee's House, Occoquan Bridge, January 29, 1862.
 Mason's Creek February 24.
 Moved to the Peninsula, VA., March 17.
 Siege of Yorktown April 5-May 4.
 Battle of Williamsburg May 5.
 Battle of Seven Pines or Fair Oaks May 31-June 1.
 Seven days before Richmond June 25-July 1.
 Oak Grove near Seven Pines June 25.
 Charles City Cross Roads and Glendale June 30.
 Malvern Hill July 1.
 At Harrison's Landing till August 16.
 Moved to Fortress Monroe, thence to Centreville August 16–27.
 Pope's Campaign in Northern Virginia August 28-September 2.
 Battles of Groveton August 29
 Second Bull Run August 30
 Chantilly September 1.
 Duty in the Defences of Washington till October.
 Movement to Falmouth October and November.
 Battle of Fredericksburg, VA., December 12–15

1863 
 "Mud March" January 20–24, 1863.
 At Falmouth till April.
 Chancellorsville Campaign April 27-May 6.
 Operations at Franklin's Crossing April 29-May 1.
 Battle of Chancellorsville May 1–5.
 Mustered out June 22, 1863, expiration of term. Three years men transferred to 40th Regiment New York Infantry.

Casualties
Regiment lost during service 5 Officers and 69 Enlisted men killed and mortally wounded and 1 Officer and 37 Enlisted men by disease. Total 112.  The regiment's bloodiest battles were Williamsburg, Seven Days, Fredericksburg, and Chancellorsville.

Armament

Soldiers in the 37th were armed with 803 Model 1842 Muskets. By the end of the first full year of hard campaigning, the regimented returned 720 Model 1842 smoothbore percussion muskets to the Adjutant General. At some point in the fall of 1861, the regiment, like others in its division, exchanged the smoothbore muskets for newer rifled muskets at the Washington DC arsenal. By the end of the first full year of hard campaigning, the regiment reported the following survey result to U.S. War Department:
 A — 15  P53 Enfield Rifled Muskets. (.58 and .577 Cal.); 55 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 Cal)
 B — 67 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 C — 63 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 D — 24 P53 Enfield Rifled Muskets (.58 and .577 Cal.); 37 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 E — 21 P53 Enfield Rifled Muskets (.58 and .577 Cal.); 41 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 F — 24 P53 Enfield Rifled Muskets (.58 and .577 Cal.); 35 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 G — 20 P53 Enfield Rifled Muskets (.58 and .577 Cal.); 46 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 H — 49 Springfield Rifled Muskets, model 1855, 1861, National Armory (NA) and contract, (.58 Cal.); 18 P53 Enfield Rifled Muskets (.58 and .577 Cal.)
 I — 35 Springfield Rifled Muskets, model 1855, 1861, NA and contract, (.58 Cal.); 22 Enfield Rifled Muskets. Caliber .58 and .577
 K — 24 P53 Enfield Rifled Muskets (.58 and .577 Cal.); 38 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)

Three months later, after an effort to get most of the companies to be armed with the same weapon to make supply easier, the regiment reported the following survey:
 A — 68 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 B — 81 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 C — 64 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 D — 65 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 E — 62 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 F — 1 P53 Enfield Rifled Muskets (.58 and .577 Cal.); 62 Austrian Rifled Muskets, quadrangular bayonet. Caliber .54 and .55
 G — 61 Austrian Rifled Muskets, quadrangular bayonet. Caliber .54 and .55
 H — 48 Springfield Rifled Muskets, model 1855, 1861, NA and contract, (.58 Cal.); 9 P53 Enfield Rifled Muskets (.58 and .577 Cal.); 2 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)
 I — 35 Springfield Rifled Muskets, model 1855, 1861, NA and contract, (.58 Cal.); 25 P53 Enfield Rifled Muskets (.58 and .577 Cal.)
 K — 4 P53 Enfield Rifled Muskets (.58 and .577 Cal.); 62 Austrian Lorenz Rifled Muskets, leaf and block sights, Quadrangular bayonet (.54 and .55 Cal)

Rifle-muskets

Uniform
The men of the regiment were initially issued the nine-button fatigue jackets dark blue sack coats, sky blue trousers or pantaloons with dark blue stripe on the outseams, and the sky blue infantry winter overcoat.

Commanders
 COL John H. McCunn - June 8 to August 31, 1861
 COL Samuel B. Hayman - September 28, 1861, to June 22, 1863.

Regimental staff
 LTC John Burke, from May 28, 1861, to February 6, 1862.
 LTC Gilbert Riordan, from January 21, 1862, to June 22, 1863.
 MAJ Dennis C. Minton, from June 7, 1861, to September 4, 1861.
 MAJ Gilbert Riordan, from September 4, 1861, to January 21, 1862.
 MAJ Patrick Henry Jones, from January 21, 1862, to October 8, 1862.
 MAJ William DeLacy, from October 8, 1862, to June 22, 1863.
 CPT John Torboss Underhill
 Adjutant Cornelius Murphy, from June 7, 1861, to November 4, 1861.
 Adjutant Patrick H. Jones, from November 8, 1861, to January 21, 1862.
 Adjutant James Henry, from January 21, 1862, to June 22, 1863.
 Quartermaster Charles H. Hoyt, from June 8, 1861, to June 8, 1862.
 Quartermaster John Phalon, from April 23, 1862, to June 22, 1863.
 Surgeon John McNulty, from June 7 to October 6, 1861.
 Surgeon William O'Meagher, from October 10, 1861, to June 22, 1863.
 Assistant Surgeon William O'Meagher, from June 8, 1861, to October 10, 1861.
 Assistant Surgeon John P. Phillips, from October 11, 1861, to February 20, 1863.
 Assistant Surgeon William B. Schermerhorn, from September 6, 1862, to June 22, 1863.
 Chaplain Peter Tissot, S.J., from May 25, 1861, to June 22, 1863.

Medal of Honor Recipients
 James Rowan O'Beirne. Commanded Company C during Battle of Seven Pines between May 31, 1862 – June 1, 1862, awarded Medal of Honor for gallantly maintaining the line of battle until ordered to fall back.
 Timothy Fallon. Age at muster, 23 years. Enlisted, May 25, 1861, at New York City, to serve two years; mustered in as private, Company K, June 7, 1861; discharged, Dec. 13, 1862, to re-enlist in Battery K, Fourth United States Artillery; awarded the Medal of Honor, Feb. 7, 1891, for gallantry in action in Battle of Williamsburg, Virginia, Battle of Seven Pines, Virginia, and Big Shanty, Ga. At Williamsburg, Virginia, assisted in driving rebel skirmishers to their main line. Participated in action, at Fair Oaks, Virginia, though excused from duty because of disability. In a charge with his company at Big Shanty, Ga., was the first man on the enemy's works.
 Martin Conboy. Age at muster, 34 years. Enlisted, Aug. 2, 1861, at New York City, to serve two years; mustered in as private, Company K, Aug. 3, 1861; transferred to Company B and promoted sergeant, Dec. 9, 1861; first sergeant, no date; mustered in as second lieutenant, Oct. 20, 1862; mustered out with company, June 22, 1863, at New York City. During the Battle of Williamsburg he took command of the company in action, the captain having been wounded, the other commissioned officers being absent, and handled it with skill and bravery. For this service he was awarded the Medal of Honor. Commissioned second lieutenant, Dec. 24, 1862, with rank from Oct. 20, 1862, vice J.O.C. Doyle, dismissed.

See also

 List of New York Civil War regiments
 New York in the Civil War

References
Footnotes

Citations

Sources

External links
 Civil War in the East - Chronology of the 37th NY Regiment
 37th New York

Military units and formations established in 1861
1861 establishments in New York (state)
Military units and formations disestablished in 1863
Infantry 37