Late in 1775 Juan Bautista de Anza led a contingent of 240 soldiers, settlers and friars from Sonora Mexico over the Gila River Trail over the Colorado River at the Yuma Crossing and up about of Alta California to the San Francisco Bay area where they arrived 28 March 1776. There the Spanish built the Mission San Francisco de Asís, (or Mission Dolores), the Presidio of San Francisco and Yerba Buena, California (San Francisco). They came with about 200 leather-jacketed soldiers, and settlers with their families and two Franciscan friars. They brought with them about 600 horses and mules, 300 Texas Longhorn bulls and cows. These animals and their descendants were the core of the later cattle and horse herds on the Californio Ranchos. These soldiers, friars, settlers and livestock came over the Anza Trail from Sonora, Mexico, four years before the trail from New Spain to California was closed for over 40 years by the Quechan people (Yumas)—most new emigrants would have to come by ship.