San Juan BautistaWinner, Presidio La Bahia Award, Sons of the Republic of Texas, 1978 In their efforts to assert dominion over vast reaches of the (now U. S.) Southwest in the seventeenth century, the Spanish built a series of far flung missions and presidios at strategic locations. One of the most important of these was San Juan Bautista del Ro Grande, located at the present day site of Guerrero in Coahuila, Mexico. Despite its significance as the main entry point