Scott's cannon open on Chapultepec at dawn; the castle has nowhere to hide
By September 1847, General Winfield Scott's army had fought its way from Veracruz to the gates of Mexico City, and one obstacle stood between them: Chapultepec, a military academy and powder depot perched atop a 200-foot hill. At 7 a.m. on September 12, American batteries opened fire on the castle and kept firing all day. The roughly 832 defenders inside, sheltered only by sandbags, beams, and shallow trenches, had nowhere to escape the shelling. Scott halted the guns at nightfall, planning to send infantry up the hill at first light.
The bombardment set up the assault that broke Mexican resistance outside its capital and forced the war toward the Treaty of Guadalupe Hidalgo, which handed the United States Texas, California, Nevada, Utah, and parts of Arizona, Colorado, New Mexico, and Wyoming. Marine Corps tradition links the red trouser stripe and the opening line of its hymn to this battle, though historians note the stripe's design predates the war.
QWhy were thirty captured American soldiers hanged where they could watch the flag change atop Chapultepec?
Colonel William S. Harney ordered the executions of members of the Saint Patrick's Battalion, mostly Irish immigrants who had deserted the U.S. Army to fight for Mexico after being captured at Churubusco, timed to the moment. Harney specified the men be hanged with Chapultepec in full view, and that the trapdoors drop at the exact moment the American flag replaced the Mexican tricolor over the castle, which happened at 9:30 that morning. The men had no loyalty to the army they abandoned, and Mexican authorities had recruited deserters into the Batallon de San Patricio with promises of land and rank. Their deaths were staged as a public spectacle of the war's final hours, not an afterthought of battlefield justice.
QHow did a lieutenant's speech in a war council change the entire American attack plan?
When Scott's officers met on September 11 to decide how to break into Mexico City, most senior commanders, including Captain Robert E. Lee, favored striking the heavily fortified southern gates rather than Chapultepec. Only General David E. Twiggs sided with Scott's preference for the western route. The deciding moment came when a young lieutenant named P. G. T. Beauregard, who would later command Confederate forces at Fort Sumter, gave a speech that persuaded General Franklin Pierce to switch his vote toward attacking Chapultepec instead. That reversal is often credited with helping tip the council toward attacking Chapultepec rather than the southern causeways.
QWhat happened to the bells of Mexico City in the months before the battle?
In May 1847, four months before American guns opened on the castle, Mexican authorities melted down church and city bells and recast them into cannonballs, a desperate bid to keep pace with an army that had already stripped away much of their artillery in earlier defeats. By the time Scott's forces reached Chapultepec, prior American victories at Cerro Gordo, Contreras, and Churubusco had already depleted Mexico's reserves so severely that recycled bell metal was going into the defense. The garrison's seven guns at Chapultepec, a mix of 24-, 8-, and 4-pounders plus one howitzer under General Manuel Gamboa, reflected just how thin those reserves had become.
