The local tribes killed the priests and the neophytes and burned the missions. Slave raiders saw the Guarani missions as "merely an opportunity of capturing more Indians than usual at a haul". In 1629, an army of Paulistas surrounded the San Antonio mission, set fire to the church and other buildings, killed those who resisted or were too young or too old to travel, and carried the rest into slavery. San Miguel and Jesus Maria quickly met the same fate. Eventually, reinforcements gathered by Father Cataldino drove off the slavers. Within two years, all but two of the establishments were destroyed, and 60,000 Christian converts were carried off for sale to São Paulo and Rio de Janeiro. The attacks usually took place on Sunday, when the whole mission population was gathered for Mass. The priests were usually spared, but several were killed. Only a few thousand natives were left of nearly 100,000 just before the Paulista invasion. Father Antonio Ruiz de Montoya purchased 10,000 cattle, and was able to convert the natives from farmers to stock raisers. Soon under Fathers Rançoncier and Romero the Uruguay missions were re-established. In 1632 the Mamelucos discovered a new line of attack from the south. In 1638, despite some successful resistance, all twelve of the missions beyond the Uruguay were abandoned and their people consolidated with the community of the Missions Territory. In the last raid Father Alfaro was killed. In the same year Father Montoya, after having successfully opposed the attempts of the governor and the bishop of Asunción to reduce the natives' liberties and the mission administration, sailed for Europe. On this trip he was successful in obtaining letters from Pope Urban VIII forbidding the enslavement of the missionaries under the severest church penalties, and from King Philip IV of Spain, permitting Guaranis to carry firearms for defense and to be trained in their use by veteran soldiers who had become Jesuits. When the next Paulista army, 800 strong, attacked the missions in 1641 they were met by a body of Christian Guarani armed with guns on the Acaray River. In two battles, the Paulista army suffered a defeat that warded off invasions for ten years. In 1651, the war between Spain and Portugal encouraged another Paulista attack to gain territory for Portugal. Before Spanish troops could arrive to help defend the missions, the fathers themselves led a Guarani army against the enemy. In 1732, at the time of their greatest prosperity, the Guarani missions were guarded by a well-drilled and well-equipped army of 7,000 Guaranis.