At the urging of Edward Fitzgerald Beale, Superintendent of Indian Affairs in California, the U.S. Army established Fort Tejon in 1854. Fort Tejon was the headquarters of the First U.S. Dragoons until those Regular Army troops were transferred to the East in July 1861 soon after the outbreak of the American Civil War. The fort was re-occupied by California volunteer troops in 1863. Those units included Companies D, E and G of the 2nd California Volunteer Cavalry from July 6 to August 17, 1863; and Company B of the 2nd California Volunteer Infantry, which remained there until Fort Tejon was abandoned for good on September 11, 1864.