On a wet December 6, 1846 day Kearny's forces encountered Andrés Pico (Californio Governor Pio Pico's brother) and a force of about 150 Californio Lancers. With most of his men mounted on weary untrained mules, his command executed an uncoordinated attack of Pico's force. They found most of their powder wet and pistols and carbines would not fire. They soon found their mules and cavalry sabers were poor defense against Californio Lancers mounted on well-trained horses. Kearny's column, along with the small force of Marines and volunteer militia, suffered defeat. About 18 men of Kearny's force were killed; retreating to a hill top to dry their powder and treat their wounded, they were surrounded by Andre Pico's forces. Kearny was slightly wounded in this encounter, the Battle of San Pasqual. Kit Carson got through Pico's men and returned to San Diego. Commodore Stockton sent a combined force of U.S. Marine and U.S. Navy bluejacket sailors under Capt. Archibald H. Gillespie (USMC),Downey, Joseph T., Ordinary Seaman, USN; Editor Lamar, Howard. (1963). P. 170. The Cruise of the Portsmouth, 1845-1847, a Sailor's View of the Naval Conquest of California. Yale University Press. and Lieutenant Edward F. Beale (USN), to relieve Kearny's column. The U.S. forces quickly drove out the Californios. In January 1847 a combined force of about 600 men consisting of Kearny's dragoons, Stockton's marines and sailors, and two companies of Frémont's California Battalion won the Battle of Rio San Gabriel and the Battle of La Mesa and retook control of Los Angeles on January 10, 1847. The Californio forces in California capitulated on January 13 to Lt. Col. John C. Frémont and his California Battalion. The Treaty of Cahuenga ended the fighting of the Mexican–American War in Alta California on that date. Kearny and Stockton decided to accept the liberal terms offered by Frémont to terminate hostilities, despite Andrés Pico's breaking his earlier, solemn pledge that he would not fight U.S. forces.
