The Battle of Río San Gabriel was fought on 8 January 1847 during the California campaign of the Mexican–American War. It took place at a ford of the San Gabriel River, at what are today parts of the cities of Whittier, Pico Rivera and Montebello, about ten miles south-east of downtown Los Angeles.
After the Battle of San Pasqual, the battered Army of the West, commanded by General Stephen W. Kearny, went to the headquarters of Commodore Robert F. Stockton at San Diego, California. Stockton's next objective was to recapture Pueblo de Los Angeles. That settlement had been previously captured by Stockton's forces but was left in the command of Captain Archibald Gillespie and had been lost to the Californio militia, commanded by General José María Flores in the Siege of Los Angeles that Fall. Stockton's force, which included six cannons this time, left San Diego on 28–29 December.
Kearny and Stockton initially disputed the right of command. Although Kearny had superior orders from the United States War Department, he had previously sent most of his troops back to Santa Fe, New Mexico, believing that the war in California had ended, and his remaining force sustained heavy losses at the Battle of San Pasqual. Stockton had a larger force and was familiar with the area, so Kearny did not initially dispute Stockton's command of the campaign to recapture Los Angeles.
U.S. scouts discovered the Mexican position at a key ford along the San Gabriel River on January 7, 1847. Approaching from the south, Stockton and Kearny planned a crossing for the next day. The U.S. forces had formed into a hollow square with the artillery and baggage in the center. Kearny ordered the artillery unlimbered to cover the crossing, but Stockton countered the order and began to move across the river. The crossing proved to be especially difficult because Flores was in a good position to contest the crossing from the high banks across the river, and the ford had patches of quicksand at the bottom of the knee deep water.
At approximately 2 pm, the Americans formed into a square when two miles from the river with the baggage and cattle in the middle, and sent skirmishers ahead. Flores attacked the square with horses, which failed, plus his makeshift ammunition and inadequate gunpowder proved to be ineffective. The U.S. officers and men manhandled their cannon across while the forward quarter of the square took cover on the river edge. Stockton personally helped unlimber and direct the artillery, which silenced both Californio cannons.
Kearny led and commanded the assault force while Stockton stayed with the guns. The left flank of the square took a Californio riverbank position and held it against a counterattack from militia lancers shouting "viva Los Californios". Then the whole square charged forward shouting "New Orleans, New Orleans", in honor of Andrew Jackson's victory against Great Britain there that day thirty-one years before. The charge took the heights, and Flores withdrew his smaller force. The battle had lasted an hour and a half.
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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