“The Justice of warring against the notorious Chichimeca Indians of Mexico was a burning issue throughout the sixteenth century.” This simple statement covers more than half a century of theological, canonical, legal, and philosophical debate over whether or not the Spanish government was justified in waging total war a fuego y a sangre against the wild Indian tribes to the north of the capital. Should these Indians continue to be regarded, as they had been in the past, as wards of the Spanish Crown and so be punished as errant children, “ delincuentes,” or should they all, men, women, and children, be declared enemies of the Spanish nation and the Christian religion and so be punished by being pursued, hunted down, subjugated, and either enslaved or exterminated? This debate went to the heart of the question of the nature and justice of Spanish rule in the Indies and it vexed the consciences of viceroys, audiencias, colonists, and churchmen. It was only natural, then, that the question should be submitted to the most important ecclesiastical gathering of colonial Mexico—the Third Mexican Provincial Council of 1585. Though passing references are sometimes made to the consideration given to the Chichimecan question by the Council, no serious study has ever been made of the discussions and arguments nor of the official stand taken by the Mexican Church. This is particularly to be regretted since such a study casts some interesting light on the mentality of the second generation of Spanish settlers in Mexico.