In late September 1861, troops from Northern California landed in San Pedro and marched to establish a new camp at a more suitable location at Camp Latham in modern Culver City. From this post Ketchum's regular soldiers were relieved on October 20 by three companies of 1st California Cavalry sent out to San Bernardino County. and establish Camp Carleton and later Camp Morris. Volunteer troops were also sent to Camp Wright in San Diego County to watch the southern overland approach to California across the Colorado Desert from Fort Yuma, located on the west bank of the Colorado River.