While marching to the conquest and occupation of California during the Mexican War, a detachment of 1st U.S. Dragoons, under the command of Brig. Gen. Stephen W. Kearny, was met on this site by native California lancers under, the command of Gen. Andres Pico. In this battle, fought on December 6, 1846, severe losses were incurred by the American forces. The native Californians withdrew after Kearny had rallied his men on the field. Gallant action on the part of both forces characterized the battle of San Pasqual, one of the significant actions during the Mexican War of 1846-1848.