11th New York Infantry

11th New York Infantry
Unit name	11th New York Infantry
Country	United States
Allegiance	Union
Branch	Infantry
Dates	May 1861 – May 1863
Size	Regiment
Garrison	New York City
Notable commanders	Robert H. Milroy; William H. Noble

11th New York Infantry was a Union volunteer regiment raised in New York City in May 1861 that served in the Eastern Theater of the American Civil War. The regiment drilled in New York and mobilized for the Army of the Potomac, participating in major operations and battles while attached to brigades and divisions that included notable formations and commanders. During its two years of service the regiment served alongside units from Pennsylvania, Massachusetts, New Jersey, and Ohio, seeing action in campaigns that linked Washington defenses, the Shenandoah Valley, and operations in Virginia.

Formation and Organization

Organized in New York City under state authority and mustered into Federal service, the regiment drew recruits from Manhattan, Brooklyn, and surrounding counties, assembling at camps where officers were mustered by state militia authorities. Early organization connected the regiment to recruiters, local politicians, and civic institutions that included New York municipal officials and civic societies influential in enlistment. Officers received commissions through New York State channels and then reported to Army of the Potomac command elements including brigade commanders in divisions led by generals assigned to the Department of Washington and later the Department of the Shenandoah. The regiment’s companies were numbered and lettered in accordance with Federal practice, equipped at state armories before receiving federal ordnance and quartermaster supplies.

Service History

The regiment mustered into Federal service in May 1861 and was initially assigned to the defenses of Washington where it performed picket, garrison, and training duties near fortifications established after the First Battle of Bull Run. Later the regiment transferred to operations in the Shenandoah Valley and to field campaigns in northern Virginia, participating in movements coordinated with Army of the Potomac columns under Major Generals and department commanders. References in orders and after-action returns placed the regiment within brigades that served under division and corps commanders engaged in operations alongside cavalry brigades, artillery batteries, and engineer detachments. The regiment’s two-year term ended with mustering out in May 1863, after which veterans and recruits were transferred to other New York regiments and Federal formations continuing service in subsequent campaigns.

Engagements and Campaigns

The regiment saw active service in campaigns and battles across Virginia and the mid-Atlantic region, participating in operations connected to major engagements such as the Shenandoah Valley campaigns, skirmishes around Manassas, and actions tied to the Army of the Potomac’s maneuvers. Its companies were engaged in picket lines, reconnaissance patrols, and frontal assaults in actions that placed them in contact with Confederate infantry, cavalry, and artillery units. The regiment’s campaign record intersected with operations connected to noted battles and campaigns involving commanders and formations from both Union and Confederate armies, contributing to larger combined-arms efforts that included infantry assaults, defensive entrenchments, and coordinated withdrawals under pressure.

Commanders and Leadership

Command leadership included field officers and company-grade officers commissioned from New York who oversaw drill, discipline, and tactical employment. Regimental commanders coordinated with brigade and division leaders to implement orders from corps and army headquarters, serving under senior generals during deployments. Staff officers handled adjutant, quartermaster, medical, and ordnance duties while chaplains and surgeons attended to spiritual and medical needs amid campaigns. Leadership transitions occurred due to promotions, casualties, and the expiration of enlistments, after which company commanders and junior officers stepped into higher responsibilities in combat and garrison duties.

Casualties and Losses

The regiment suffered casualties from combat, disease, and other service-related causes typical of Union regiments operating in the Eastern Theater. Casualty reports recorded killed, wounded, missing, and captured in specific engagements as well as deaths from disease in army hospitals and on campaign. Non-combat losses due to illness were significant, with regimental surgeons treating infectious diseases common in army camps and transports. Post-service records and veterans’ rosters documented officer and enlisted men who were killed in action, mortally wounded, or who died of disease, as well as those discharged for disability or transferred to other units.

Uniforms, Regimental Insignia, and Equipment

Soldiers wore Federal regulation frock coats and forage caps issued through New York quartermaster depots, supplemented by locally procured clothing during the regiment’s early weeks. The regiment used standard infantry muskets and rifled muskets supplied by federal ordnance, bayonets, cartridge boxes, and accoutrements consistent with Union infantry equipment. Regimental colors — a national flag and a state or regimental flag — were carried by color bearers and were central to unit identity during parade and battle. Insignia and company devices reflected New York civic symbols and local emblems popular among volunteer regiments, and men sometimes personalized gear with unit nicknames, business-trade tokens, and privately purchased items from sutlers during encampments.

Legacy and Commemoration

After mustering out, veterans of the regiment participated in veteran associations, reunions, and Memorial Day observances celebrating comradeship and remembering the fallen, with names inscribed on regimental rolls and in New York veterans’ publications. Monuments, plaques, and cemetery markers in New York and at battlefield sites commemorate members of the regiment alongside broader monuments to the Army of the Potomac, state volunteer regiments, and county-level memorials. Archival records, muster rolls, and pension files preserved in state and federal repositories continue to support genealogical research, regimental histories, and scholarly studies that link the regiment to Civil War historiography, veterans’ organizations, and civic remembrance in postwar New York.

New York City Manhattan Brooklyn New York (state) Army of the Potomac Department of Washington Shenandoah Valley Manassas First Battle of Bull Run Virginia Northern Virginia campaign Union (American Civil War) Confederate States Army Major General Brigadier General Quartermaster Adjutant Surgeon Chaplains Picket Skirmish Reconnaissance Infantry Cavalry Artillery Engineer Battery (artillery) Musket Rifle (firearm) Bayonet Forage cap Frock coat National flag (United States) State flag Sutler Memorial Day Veteran Reunion (social) Monument Cemetery Muster roll Pension Archive Historiography Regimental history Genealogy New York State Militia New York City recruiting Ordnance Quartermaster Depot Army hospital Disease (pathology) Infectious disease Campaign (military) Battle Skirmish line Color bearer Company (military) Regiment Veterans' organization Civil War Eastern Theater Federal service Commission (military) Promotion Casualty Killed in action Wounded in action Missing in action Captured Discharge (military) Transfer (military) Officer Enlisted man Union veteran publications State repository Federal repository Military drill Encampment Sutler wagon Private purchase Personal effects Flag staff Regimental colors Company device Civic society Recruiter County memorial Veterans' roster Roster After-action report Return (military) Mustering out Two-year regiment Volunteer regiment New York veterans Civil War monument Battlefield marker Military surgeon Medical records Postwar remembrance Commemoration Newspaper (periodical) Contemporary account Eyewitness account Soldier memoir Regimental roster War department records State adjutant general Historical society Museum Battlefield preservation Antietam Gettysburg Fredericksburg Chancellorsville Rappahannock River Potomac River Baltimore Harper's Ferry Alexandria, Virginia Fort Washington Camp Harrington Camp Scott Camp McClellan Company A Company B Company C Company D Company E Company F Company G Company H Company I Company K Colonel Lieutenant Colonel Major Captain Lieutenant Sergeant Corporal Private