Battle of San Jacinto

Battle of San Jacinto, (April 21, 1836), defeat of a Mexican army of about 1,200–1,300 men under Antonio López de Santa Anna by about 900 men (mostly recent American arrivals in Texas) led by Gen. Sam Houston. Fought along the San Jacinto River, near the site of what was to be the city of Houston, the battle ensured the success of American settlers in the Texas Revolution (War of Texas Independence).

Citizens of the new Republic of Texas responded to the destruction of the Alamo and massacre of the unarmed “Texians” captured at Goliad with outrage. Volunteer companies rushed to join General Samuel Houston’s growing Texas army. Meanwhile, Mexican General Santa Anna marched his army to crush the Texan rebels.

Texas Revolution Events

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Battle of the Alamo

February 23, 1836 - March 6, 1836

Battle of San Jacinto

April 21, 1836

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Houston avoided contact with the pursuing Mexican army until his Texas army gained strength and training. Santa Anna, on the other hand, split his force into three, sending some units to secure his long supply line while others sought to capture the provisional Texan government. He personally led the remaining 600 men after Houston.

On 20 April, the two armies met at Buffalo Bayou, a low area of marshland and wetlands near the San Jacinto River. Santa Anna attempted unsuccessfully to probe the Texan position, and there was an exchange of artillery fire. About 500 Mexican reinforcements arrived, but more were prevented from joining their comrades after Erastus “Deaf” Smith, Houston’s chief guide, destroyed the only bridge. Santa Anna decided to rest his new and tired troops before attacking, but he failed to post sentries. When no attack followed in the morning, the Mexican troops relaxed even further. A Texan council of war, in the meantime, voted to attack, and Houston launched his 900 Texans in a risky assault that afternoon. His mounted troops rode around the Mexican flanks while the Texan battle line moved quickly and quietly directly across the open prairie. They were within 200 yards (183 m) of the Mexican camp when discovered. At that moment, Houston’s artillery, the famed “Twin Sisters” cannons, opened fire, and the Texan infantry charged. After days of retreat, Houston’s men relished the attack, taking the resting Mexican force by surprise (during the Mexicans’ siesta), shouting, "Remember the Alamo, remember Goliad!" (Legend holds that Santa Anna was slow to respond to the assault because he was romantically involved with a woman when the attack unfolded, but that account is probably apocryphal.)

The Texans fired at close range and rolled over the hasty Mexican breastworks. Santa Anna’s defense collapsed as panicked Mexicans tried to flee the cavalry across the marshes. After an eighteen-minute fight, the remaining Mexicans surrendered, but Santa Anna slipped away in a private’s uniform. Within 24 hours, some 600 Mexicans had been killed and more than 700 captured, including eventually Santa Anna himself, recognised only after Mexican soldiers addressed him as “Presidente.” Nine of Houston’s men had been killed or mortally wounded, and about 30 wounded less seriously, in this heavily lopsided victory. Houston’s ankle was shattered by a musket ball, and he received Santa Anna’s surrender while lying on a blanket under a live oak whose descendant can be found in San Jacinto Battleground State Historic Site today.

Santa Anna and his soldiers were freed after he agreed to end the war, and Santa Anna returned to Mexico City. Houston’s victory at San Jacinto, the final military engagement of the Texas Revolution, led to the founding of the independent Republic of Texas—and, indirectly, to the U.S. war with Mexico the following decade. Though brief in duration, then, the battle can be considered one of the most consequential in the history of the United States.

Losses: Mexican, 630 dead, 208 wounded, 730 captured; Texan, 9 dead, 30 wounded.