The capture of Santa Fe occurred during the Mexican–American War as part of a broader United States campaign to secure the New Mexico Territory and Alta California. General Stephen W. Kearny led the Army of the West, comprising approximately 1,700 men, southwest from Fort Leavenworth, Kansas toward Santa Fe, the capital of the Mexican Province of New Mexico. The operation took place between 8 August and 14 August 1846, during a critical period of American westward military expansion.
Governor Manuel Armijo of Santa Fe initially faced pressure from Catholic priests, Diego Archuleta (the regular-army commander), and young militia officers Manuel Chaves and Miguel Pino to mount a defense against the approaching American forces. Armijo established a defensive position in Apache Canyon, a narrow pass approximately 10 miles southeast of the city, on August 9. However, by August 14—before the American army had even come into view—Armijo made the decision to abandon the defense. An American named James Magoffin claimed credit for convincing both Armijo and Archuleta to avoid conflict, though an unverified account suggests Magoffin may have bribed Armijo. When Pino, Chaves, and some militiamen insisted on fighting, Armijo ordered them to stand down.
The capture of Santa Fe concluded without any shots fired, making it a bloodless takeover of the Mexican provincial capital. This peaceful acquisition represented a significant American success in securing New Mexico during the Mexican–American War, as Kearny's Army of the West achieved its objective of taking the territory without military engagement or casualties from combat.
The Mexican-American War (1846–1848) grew from the annexation of Texas (1845) and a disputed border between Texas and Mexico at the Rio Grande. President James K. Polk ordered US troops under General Zachary Taylor into the contested zone; after a skirmish that killed American soldiers, Congress declared war in May 1846. US forces won a series of engagements — Palo Alto, Monterrey, Buena Vista — before General Winfield Scott led an amphibious landing at Veracruz and an overland campaign to Mexico City, which fell in September 1847. The Treaty of Guadalupe Hidalgo (February 1848) transferred California, Nevada, Utah, most of Arizona and New Mexico, and parts of Colorado and Wyoming to the United States in exchange for $15 million and assumption of $3.25 million in claims — roughly 525,000 square miles, a 67 percent expansion of US territory. The war's outcome immediately reopened the slavery question: the Wilmot Proviso, debated throughout the war, proposed banning slavery from any territory acquired from Mexico, foreshadowing the sectional crisis of the 1850s.
None from enemy action; significant from heat and disease
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