Juan Bautista de Anza led the Spanish colonizing expedition in 1775-76 that opened a trail from Arizona to California and established a presidio at San Francisco Bay. Franciscan missionary Fray Pedro Font accompanied Anza. As chaplain and geographer, Font kept a detailed daily record of the expedition's progress that today is considered one of the fundamental documents of exploration in the American Southwest. This edition is the most complete account of the Anza expedition and a foundational primary source in California and Southwest history.