During the Mexican-American War, Puente Nacional became a critical strategic location along the National Road connecting Veracruz to Mexico City. The bridge, originally named Puente del Rey and constructed by the Spanish in 1806 over the Antigua River, served as a vital artery for American military operations. The geography and topography of the area made it particularly vulnerable to guerrilla tactics, creating a natural bottleneck where Mexican forces could effectively ambush supply convoys.
Between June, July, and August 1847, Mexican guerrillas conducted multiple engagements against U.S. troops stationed to guard supply wagon trains crossing the bridge. These attacks targeted American forces protecting the crucial line of communications that sustained the U.S. army's advance into Mexico's interior during 1847-1848. The repeated skirmishes reflected the broader strategy of Mexican resistance forces to disrupt American logistics rather than engage in conventional pitched battles.
Following the capture of Mexico City, General Winfield Scott recognized the strategic importance of securing this route and established defensive posts along the National Road to suppress guerrilla activity. One of these garrison posts was manned with 750 soldiers, demonstrating the significant military resources the Americans devoted to protecting this single location. The battle record at Puente Nacional exemplified the nature of the latter phases of the Mexican-American War, where American forces shifted from offensive operations to defensive measures aimed at maintaining supply lines and occupying conquered territory against sustained resistance.
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.
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