History Remembered: The Battle of Glorieta Pass

Overview

The Battle of Glorieta Pass, fought from March 26-28, 1862, was a pivotal engagement in the New Mexico Campaign of the American Civil War. It took place in the rugged Sangre de Cristo Mountains southeast of Santa Fe, in the New Mexico Territory. While tactically a Confederate victory in the field, the battle resulted in a decisive strategic Union victory that ended the Confederate ambition to capture the Western territories and potentially push on to California.

Background: The Confederate Invasion of New Mexico

• Confederate Goal: The Confederacy, under the leadership of Brigadier General Henry H. Sibley, aimed to seize the resource-rich Colorado and California gold fields, gain access to Pacific ports, and potentially recruit sympathizers in New Mexico and Arizona. Sibley raised a brigade of about 2,500 Texans for this campaign.

• Early Success: Sibley’s forces had driven Union forces under Colonel Edward Canby out of southern New Mexico after victories at Valverde (February 21, 1862). They captured Albuquerque and Santa Fe in March 1862, though their supply lines were stretched dangerously thin.

The Union Response

• Colorado Volunteers: Union forces in the region were a mix of regular troops and volunteers. A crucial element was the 1st Colorado Volunteer Infantry, known as the “Pikes Peakers,” under the command of Colonel John P. Slough. These tough frontiersmen made a forced march from Denver through winter snows to reinforce the Union.

• Command Structure: The overall Union commander in the region was Colonel Canby, but the forces at Glorieta were directly commanded by Major John M. Chivington (a Methodist minister turned soldier) initially, and later by Colonel Slough.

The Battle: Three Days of Fighting

The battle occurred in two main areas: the Apache Canyon approach and the main Glorieta Pass itself.

1. March 26 (First Battle of Apache Canyon):

   • A Confederate detachment of 300-400 men under Major Charles L. Pyron, advancing east from Santa Fe, clashed with Chivington’s advance Union force.

   • Chivington used the rugged terrain to ambush the Confederates, capturing men and supplies. This initial skirmish was a clear Union victory and checked the Confederate advance.

2. March 28 (The Main Battle at Glorieta Pass):

   • The Pass (Pigeon’s Ranch): Confederate forces, now reinforced to about 1,100 men under Colonel William R. Scurry, pushed through the pass and engaged Slough’s main Union force of about 900 men. A fierce, day-long, back-and-forth infantry battle ensued along the Santa Fe Trail near Pigeon’s Ranch and the rocky “Sharpshooter’s Ridge.” The Confederates, using the high ground, eventually forced the Union troops to withdraw from the field. Tactically, Scurry had won.

   • The Turning Point (Johnson’s Ranch): While the main forces battled at the pass, Major Chivington, guided by Lt. Col. Manuel Chávez and local Unionist scouts, led a detachment of about 400 Colorado volunteers on a daring flanking maneuver over 2,000-foot-high Glorieta Mesa. They descended undetected behind the Confederate lines at Johnson’s Ranch, the enemy’s supply depot and camp.

   • The Destruction of the Supply Train: Chivington’s men surprised and captured the small Confederate guard. They then methodically destroyed the Confederates’ entire supply train: 80+ wagons of food, ammunition, medical supplies, and forage. They also slaughtered or drove off over 500 horses and mules. Anything they couldn’t carry was burned or smashed. They then escaped back over the mesa.

Aftermath and Significance

• Strategic Catastrophe for the Confederates: When Colonel Scurry’s victorious but battered army returned to Johnson’s Ranch, they found a scene of utter ruin. With no supplies, ammunition, or transport animals, their campaign was instantly untenable. They could not advance, nor could they hold Santa Fe.

• The Retreat: The Confederate army was forced into a miserable, starving retreat back to Santa Fe and then all the way to Texas, harassed by Union forces and Apache warriors along the way. The New Mexico Campaign collapsed.

• “Gettysburg of the West”: This title is given because, like Gettysburg, Glorieta Pass was the “high-water mark” of Confederate ambition in a specific theater. Never again would a Confederate force campaign in the Far West. The battle secured the Union hold on the New Mexico and Arizona Territories, the future states of Colorado and Nevada, and ultimately the gold fields of California for the Union war effort.

• Legacy: The battle is remembered for its dramatic combination of a conventional frontal battle and a decisive, unconventional raid. Major Chivington, celebrated as a hero at Glorieta, would later become infamous for his role in the 1864 Sand Creek Massacre of peaceful Cheyenne and Arapaho villagers.

In summary, the Battle of Glorieta Pass was a classic example of a tactical victory (for the Confederates on the battlefield) turning into a catastrophic strategic defeat due to the complete loss of logistical support, making it one of the most decisive and fateful engagements of the Civil War’s western theater.