Battle Of La Mesa Begins
Kearny's command was bloodied and in poor condition but pushed on until they had to establish a defensive position on "Mule" Hill near present-day Escondido.
The Californios besieged the dragoons for four days until Commodore Stockton's relief force arrived. The resupplied, combined American force marched north from San Diego on December 29 and entered the Los Angeles area on January 8, 1847, linking up with Frémont's men there. American forces now totalling 607 soldiers and marines fought and defeated a Californio force of about 300 men under the command of Captain-general Flores in the decisive Battle of Rio San Gabriel. The next day, January 9, 1847, the Americans fought and won the Battle of La Mesa. On January 12, the last significant body of Californios surrendered to U.S. forces. That marked the end of armed resistance in California, and the Treaty of Cahuenga was signed the next day, on January 13, 1847.
The Battle of La Mesa of the Mexican-American War occurred on January 9, 1847, in present-day Vernon, California, the day after the Battle of Rio San Gabriel.
Wikipedia: Battle Of La Mesa
Wikipedia: Mexican-American War