After reaching San Diego, California, Stockton dispatched Beale to serve with the land forces. Beale and a small body of men under Lt. Archibald Gillespie joined General Stephen W. Kearny's column just before the Battle of San Pasqual on December 6, 1846. After the Mexican Army surrounded the small American force and threatened to destroy it, Beale and two other men (his Delaware Indian servant and Kit Carson) crept through the Mexican lines and made their way to San Diego for reinforcements. Two months later, although Beale still suffered from the effects his adventure, Stockton again sent him east with dispatches. Beale reached Washington about June 1. In October he appeared as a defense witness for John C. Frémont at the "Pathfinder's" court martial.