But their opponents though beaten time and again were not disheartened. The infidel philosophers of the eighteenth century recognised in the Jesuits the ablest defenders of the Catholic Church. If only they could succeed in removing them, as Voltaire declared, the work of destroying the Church seemed comparatively easy. Hence they united all their forces for one grand assault upon the Society as the bulwark of Christianity. They were assisted in their schemes by the Jansenists, eager to avenge the defeat they had received at the hands of the Jesuits, and by the absolutist statesmen and rulers of Europe, who aimed at the enslavement of the Church, and who feared the Jesuits as the ablest exponents of the rights of religion and of the Holy See. The Jesuits controlled to a great extent Catholic education both lay and clerical, and it was hoped that by installing teachers devoted to state supremacy and Enlightenment in their place the future of absolutism and of rationalism might be assured. The attack on the Jesuits was begun in Portugal during the reign of Joseph Emmanuel (1750-1777). He was a man of liberal views, anxious to promote the welfare of his country, as well as to strengthen the power of the crown. In accomplishing these objects he was guided by the advice of the prime minister, Joseph Sebastian Carvalho, better known as the Marquis of Pombal.[2] The latter had travelled much, and was thoroughly imbued with the liberal and rationalistic spirit of the age. He regarded the Catholic Church as an enemy of material progress, and the Jesuits as the worst teachers to whom the youth of any country could be entrusted. A treaty concluded with Spain, according to which the Spaniards were to surrender to Portugal seven of the Reductions of Paraguay in return for San Sacramento, afforded him the long desired opportunity of attacking the Jesuits (1750). The Indians on the Reductions, who had been converted by the Jesuits, were to be banished from their lands to make way for mining operations in search of gold, and though the Jesuits tried hard to induce their people to submit to this decree, the Indians, maddened by the injustice and cruelty of the treatment of the Portuguese, rose in revolt. The Jesuits were blamed for having fomented the rebellion. By orders of Pombal they were arrested and brought to Portugal, where the most extravagant charges were published against them in order to damage them in the eyes of the people.