2nd Colorado Infantry Regiment

2nd Colorado Infantry Regiment
Unit name	2nd Colorado Infantry Regiment
Dates	1862–1863
Country	United States
Allegiance	Union
Branch	Volunteer Infantry
Type	Infantry
Size	Regiment
Garrison	Denver
Battles	New Mexico Campaign, Battle of Glorieta Pass, Indian Wars
Notable commanders	Colonel William Gilpin, Colonel John P. Slough

2nd Colorado Infantry Regiment was a volunteer infantry regiment raised in the Colorado Territory during the American Civil War that served in the Trans-Mississippi Theater and in operations connected to the New Mexico Territory and western frontier. Organized amid threats from Confederate forces and various Native American nations, the regiment participated in campaigns that intersected with the New Mexico Campaign, Department of the West operations, and regional garrison duty. Officers and enlisted men included veterans of territorial politics, militia service, and earlier territorial volunteer units such as the 1st Colorado Infantry Regiment and 1st Colorado Cavalry Regiment.

Formation and Organization

The regiment was organized at Denver and other Colorado Territory localities during 1862 under the auspices of territorial authorities including Territorial Governor John Evans and leaders like William Gilpin. Companies were drawn from mining communities such as Central City, Colorado, Boulder, Colorado, Colorado Springs, Colorado, and frontier settlements like Fort Garland and Fort Larned. Recruitment relied on existing militia structures exemplified by the Colorado Militia and volunteer frameworks tied to United States Volunteers regulations. The unit's muster rolls reflected men formerly associated with the 1st Colorado Infantry Regiment, 1st Colorado Cavalry Regiment, and independent companies raised during the Pikes Peak Gold Rush. Officers received commissions under territorial adjutant authority and were mustered into Federal service pursuant to Militia Act of 1792 precedents applied during the American Civil War mobilization in western territories.

Service History

After organization the regiment moved to posts across the Southwest, reporting to commands such as the Department of New Mexico and the Army of the Frontier. Detachments garrisoned strategic points including Fort Union (New Mexico), Fort Lyon, and Trinidad, Colorado. Elements were employed in convoy duty along the Santa Fe Trail and escorted supply trains used by Union Army forces engaged in the New Mexico Campaign against Confederate incursions led by figures associated with the Confederate States of America western strategy. The 2nd Colorado served alongside units like the 3rd Colorado Cavalry Regiment, 9th Kansas Cavalry Regiment, and regulars from the 12th U.S. Infantry Regiment in combined operations and patrols confronting Confederate irregulars, New Mexico Campaign detachments, and clashes related to the Pueblo Revolt legacy of the region. The regiment also undertook scouting and counterinsurgency tasks related to ongoing tensions with Cheyenne, Arapaho, Ute, and Comanche peoples during the broader Indian Wars period.

Commanders and Notable Personnel

Commanding officers included territorial and Federal figures such as Colonel William Gilpin, who earlier held prominence in Colorado Territory politics, and Colonel John P. Slough, a later territorial official and commander with Civil War experience. Other officers were drawn from local political leaders, militia captains, and veterans of frontier service, including men who later served in territorial government roles such as Jerome B. Chaffee and Horace Tabor-era contemporaries. Noncommissioned officers and lieutenants often had prior service in militia units like the Colorado Mounted Rangers or experienced frontier soldiers from Fort Carson-era detachments. Several enlisted men later appear in territorial records, mining company directories such as those linked to the Colorado Gold Rush, and pension rolls administered by the United States Pension Bureau.

Engagements and Battles

The regiment’s operations intersected with major Western engagements, most notably actions tied to the New Mexico Campaign and skirmishes surrounding the Battle of Glorieta Pass. Companies participated in escorting logistics elements that supported Brigadier General James H. Carleton and Major General Henry W. Halleck-aligned movements, and in localized engagements confronting Confederate columns associated with leaders who operated under the Trans-Mississippi theater directives. The 2nd Colorado also saw action in numerous skirmishes and escorts related to protecting Santa Fe Trail commerce, and in operations that brought them into contact with volunteer units like the 1st Colorado Cavalry Regiment, the 3rd California Volunteer Infantry, and the 9th Kansas Cavalry Regiment. Frontier clashes with Native American groups, associated with campaigns led by regional commanders from posts such as Fort Laramie and Fort Bent, are recorded in unit dispatches and territorial reports.

Casualties and Strength

Regimental strength fluctuated with recruitment drives, sickness, detachments, and reenlistments; initial muster figures placed the regiment at roughly ten companies typical of Federal volunteer infantry regiments of the period, with combined strength near regimental complements recorded in Army muster tables. Casualties resulted from combat, disease, and the rigors of frontier service; deaths from dysentery, typhoid fever, and exposure were common in territorial postings, and several men were recorded as killed or mortally wounded in skirmishes connected with the New Mexico Campaign and frontier confrontations. Desertion and transfers to units such as the 1st Colorado Cavalry Regiment and 4th California Infantry affected manpower, while detachment losses during convoy ambushes and scouting missions further altered effective strength.

Legacy and Disbandment

The 2nd Colorado Infantry Regiment was consolidated, reorganized, or mustered out in the shifting administrative changes of 1863 as Federal needs in the western territories evolved, with many veterans transferring into units like the 3rd Colorado Cavalry Regiment or receiving commissions in territorial civil service and mining enterprises. Its service contributed to securing Union control of the Southwest United States interior lines, influenced postwar territorial defense practices at posts including Fort Garland and Fort Lyon, and fed into the later political careers of veterans who participated in Reconstruction-era territorial governance and Colorado statehood debates. Regimental records and veterans’ affidavits appear in collections tied to the National Archives and Records Administration and in territorial newspapers archived by institutions such as the Denver Public Library.

Category:Units and formations of the Union Army from Colorado