Spanish fort established 1751 to protect Mission Santa Cruz de San Saba. Mission experienced increasing hostility from Indians, and presidio commander urged missionaries to abandon their effort. They refused, and on Mar. 16, 1758, a strong force of Comanche and other Indians overran the mission, killed many occupants and burned the buildings. Only a few escaped. Small relief force of soldiers from this presidio were so fiercely attacked, they were unable to prevent mission destruction. Presidio was abandoned in 1769. Ruins maintained as county park 2 miles west off U.S. 190.