The Battle of Glorieta Pass was fought March 26–28, 1862, in the northern New Mexico Territory, by Union and Confederate forces during the American Civil War. While not the largest battle of the New Mexico campaign, the Battle of Glorieta Pass ended the Confederacy's efforts to capture the territory and other parts of the western United States.
The battle took place at the eponymous mountain pass in the Sangre de Cristo Mountains, in what is now Santa Fe County, New Mexico. Confederate forces sought to break the Union's possession of the West along the base of the Rocky Mountains, with the ultimate aim of controlling strategically valuable mines, railroads, and cities throughout the region. The invasion was the westernmost military operation of the war, and the South's only real attempt to conquer and occupy Union territory.
A skirmish occurred on March 26 between advance elements from each army, with the main battle occurring on March 28. Although the Confederates were able to push Union forces back through the pass, they had to retreat when their supply train was destroyed and most of their horses and mules were killed or driven off. Eventually, the invading force was forced to withdraw entirely from the territory, with the Union retaking full control by June.
As the Confederacy never attempted another invasion of the region, Glorieta Pass represented the climax of the ambitious New Mexico campaign, remaining an important event in New Mexico's Civil War history.https://www.tshaonline.org/handbook/entries/glorieta-battle-of
New Mexico campaign
The southern portion of the New Mexico Territory had been largely neglected by both the federal government and the territorial government in Santa Fe. As a result, Confederate sympathy was strong, in hopes of receiving better treatment by the new government. Following secession moves by residents, Confederate forces seized Mesilla and captured the federal troops there, who made a halfhearted attempt to retreat to Santa Fe. In early 1862, the Confederacy established the Confederate Arizona Territory, which included the southern halves of both modern Arizona and New Mexico. The territorial capital was at Mesilla, some from El Paso and near today's major city of Las Cruces. The strategic goals were to gain access to the gold and silver mines of California and the Colorado Territory and the seaports in Southern California, and thus evade the Union naval blockade.Frazier, p. 75Whitlock, pp. 60–61
The commanders of the New Mexico Campaign were Confederate Brig. Gen. Henry Hopkins Sibley and Union Col. Edward Canby. Sibley attempted to capture Fort Craig, completely outmaneuvering Canby at the Battle of Valverde in February and driving him back into his fort, but failed to force Canby's surrender. Sibley then bypassed the fort and advanced north through the Rio Grande Valley, occupying Santa Fe on March 10. Canby remained at Fort Craig, hoping to cut Sibley's logistical support from Texas and awaiting reinforcements before he dared to take the offensive. Sibley made his headquarters at the abandoned Union storehouse at Albuquerque.
In March, Sibley sent a Confederate force of 200–300 Texans under the command of Maj. Charles L. Pyron on an advance expedition over the Glorieta Pass, a strategic location on the Santa Fe Trail at the southern tip of the Sangre de Cristo Mountains southeast of Santa Fe. Control of the pass would allow the Confederates to advance onto the High Plains and make an assault on Fort Union, a Union stronghold on the route northward over Raton Pass. Sibley sent six companies under the command of Col. Tom Green to block the eastern end of Glorieta Pass, turning any Union defensive position in the Sangre de Cristos.Frazier, p. 199
Opposing forces Union
Union forces were led by Col. John P. Slough of the 1st Colorado Infantry, with units under the command of Maj. John M. Chivington. Canby had called up local militia and volunteer forces, as well as volunteers from Colorado. In the action on March 26, Chivington had three infantry companies and one mounted company of the 1st Colorado and a detachment of the 1st and 3rd U.S. Cavalry regiments.Whitlock, p. 171 During the main battle on the 28th, Slough commanded, in person, nine companies of the 1st Colorado, a detachment from the 1st, 2nd and 3rd U.S. Cavalry regiments, and two artillery batteries.Frazier, pp. 205, 215 Chivington commanded five companies of the 5th U.S. Infantry, one company from the 1st Colorado, James Hobart Ford's independent company from the 2nd Colorado, and some New Mexico militiamen.Whitlock, p. 188
Confederate
The Confederates were led by Charles L. Pyron and William Read Scurry. From late summer to early autumn of 1861, the Confederacy raised a brigade of three volunteer mounted regiments—the 4th, 5th and 7th Texas Mounted Volunteers—along with supporting artillery and supply units. Virtually every field officer was a veteran of the Indian Wars or the Mexican-American War. During the battle on March 26, Pyron had his battalion of the 2nd Texas Mounted Rifles,This battalion also included companies of Arizona Confederates. four companies of the 5th Texas Mounted Rifles under Maj. John Shropshire and two cannons; Scurry's force included nine companies of the 4th Texas Mounted Rifles under Maj. Henry Raguet, five companies of the 7th Texas Mounted Rifles under Maj. Powhatan Jordan and three additional cannons.
Battle
Prior to the battle, Union forces performed a forced march from Denver, over Raton Pass, to Fort Union and then to Glorieta Pass, covering the distance of in 14 days. Combat commenced shortly after their arrival at the battlefield, leaving them little time to recuperate.Hudnall, p. 291
Apache Canyon
Pyron's force of 300 camped at Apache Canyon, at one end of Glorieta Pass, leaving a picket post of 50 men at the summit of the pass. Chivington led 418 soldiers to the pass, and on the morning of March 26, moved out to attack. After noon, Chivington's men captured the picket post and found the main force behind them. Chivington advanced on them, but their artillery fire threw him back. He regrouped, split his force to the two sides of the pass, caught the Confederates in a crossfire, and soon forced them to retire. Pyron retired about to a narrow section of the pass and formed a defensive line before Chivington's men appeared. The Union forces flanked Pyron's men again and punished them with enfilade fire. Pyron ordered another retreat, but the withdrawal of the artillery caused the Confederates to become disorganized and start fighting in separate clusters of men. Chivington ordered a mounted Colorado company to make a frontal charge against the artillery; this succeeded in capturing several Confederates and scattering the rest. Not knowing if Confederate reinforcements were nearby, Chivington then retired and went into camp at Kozlowski's Ranch to await Slough with the main body. His small victory was a morale boost for Slough's army.Josephy, pp. 79–81.Frazier, pp. 208–210
No fighting occurred the next day, as reinforcements arrived for both sides. Scurry's troops arrived at 3:00 am on March 27, swelling the Confederate force to about 1,100 men and five cannons; as senior officer present, he took command of the entire Confederate force. Thinking that Slough would attack again and expecting Green to arrive in the Union rear at any time, Scurry chose to remain in place for the day, digging rifle pits.Frazier, pp. 211–212. Slough arrived early in the morning of March 28 with about 900 more men, bringing the Union strength to 1,300.
Glorieta Pass
Both Scurry and Slough decided to attack on March 28 and set out early to do so. Expecting the Confederates to remain in Apache Canyon, Slough sent Chivington with two infantry battalions, under Lewis and Wynkoop, out in a circling movement with orders to go hide out at Glorieta Pass and hit the Texans in the flank once Slough's main force had engaged their front.Frazier, p. 214 Chivington did as ordered, and his men waited above the pass for Slough and the enemy to arrive. Instead of remaining at Apache Canyon as Slough had expected, though, Scurry advanced down the canyon more rapidly than Slough had anticipated. Scurry believed the Union force was retreating to Fort Union. He intended to attack them until Green could arrive. One cannon and a small guard were left at Johnson's Ranch, while the rest of the Confederate force—more than 1000 men—marched eastwards along the Santa Fe Trail.Frazier, pp. 213–214.
When Slough found the Texans so far forward, he launched an attack, hitting them about 11:00 am, some from Pigeon's Ranch. A provisional battalion of four companies from the 1st Colorado, supported by both batteries, was commanded by Lt. Col. Samuel F. Tappan, who deployed his men across the trail.Whitlock, p. 190 The Confederates dismounted and formed a line across the canyon, but the terrain caused some companies to become intermingled.Frazier, p. 216 Tappan was initially successful and held his ground for a half-hour, but the Confederates' numerical superiority enabled them to outflank Tappan's line by noon. The Union troops were thrown back in confusion, but managed to take up position around the adobe ranch buildings. Slough reformed his men several hundred yards closer to Pigeon's Ranch, with the four companies under Tappan and an artillery battery on a hill to the left, the other battery supported by two companies in the center across the road, and the remaining two companies on the ridge to the right.Whitlock, p. 200.
Scurry then launched a three-pronged attack. Pyron and Raguet were ordered to attack the Union right and Shropshire the Union left, with the remainder led by Scurry against the Union center, and the artillery firing in support.Frazier, p. 219. The attack on the Union left was beaten back, with Shropshire killed. The attack on the center stalled, while the artillery was forced to withdraw after one cannon was disabled and a limber destroyed. The attack itself then stalled, with the Confederates fighting by squads "with a desperation unequaled by any engagement of the war."Whitlock, p. 201 At around 3:00 pm, the Confederates outflanked the Union right, but Raguet was mortally wounded. From the ridge (thereafter known as "Sharpshooters Ridge"), Confederate riflemen started picking off the artillerymen and infantry below them. Scurry again pressed the Union center, and the Union position became untenable. Slough reluctantly ordered a retreat, and Tappan formed the companies on the left into a rear guard. Slough reformed his line a half-mile east of Pigeon's Ranch, where skirmishing continued until dusk. The Union men finally retreated to Kozlowski's Ranch, leaving the Confederates in possession of the battlefield.
Johnson's Ranch