The Battle of Dominguez Rancho, or the Battle of the Old Woman's Gun, was a military engagement of the Mexican–American War that took place on October 8–9, 1846, within Manuel Dominguez's 75,000-acre (30,000 ha) Rancho San Pedro. Captain José Antonio Carrillo, leading fifty California troops, successfully held off an invasion of Pueblo de Los Angeles by some 300 United States Marines, capturing for the first time in the few instances of U.S. Colors upon the battlefield, while under the command of US Navy Captain William Mervine, who was attempting to recapture the town after the Siege of Los A
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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