Stanislaus was caught in the middle. Familiar with the beliefs of his Catholic countrymen, he begged the empress not to intrude in religious matters. To his ambassador in St. Petersburg, the king wrote, “[This demand] is a real thunderbolt for the country and for me personally. If it is still humanly possible, try to make the empress see that the crown which she procured for me will become a shirt of Nessus. I shall be burned alive and my end will be frightful.”
Catherine ignored his plea. She felt her moral position to be unassailable; she was upholding the rights of a persecuted minority against the Catholic Church. Beyond that, she had given money to Stanislaus; she felt that she had bought and paid for his support. She instructed her ambassador to enforce her policy.
Frederick of Prussia was happy to stand aside in Catherine’s struggle with the king and the Diet, and to devote himself to fomenting discontent in the Protestant areas of northern Poland. This served to strengthen the resistance of Polish Catholics to all foreign intervention and make Catherine’s effort more difficult. With members of the Diet obdurate and sullen, with Catholic bishops thundering against the wickedness of the dissenters, with some members of the nobility arming their followers, Catherine saw no alternative except to send more Russian troops into Poland. When the next Diet met in October 1767, Warsaw was occupied by a Russian army. Repnin surrounded the Diet building with soldiers and placed some of them inside the Diet chamber to ensure that members voted as he instructed them. At first, the Diet refused to be intimidated. When bishops spoke against dissident rights, members roared approval. Repnin then arrested the two leading bishops, including the elderly bishop of Kraców, and sent them across the border to exile in Russia. Members looked to their king to protest, but Stanislaus accepted Repnin’s demands, whereupon they accused the king of betraying his country to the Russians. On November 7, 1767, the Diet, with multiple absentees, with Russian bayonets gleaming everywhere, and finding no one to rally behind, grudgingly submitted and agreed to equal rights for “dissidents.” Catherine and Repnin, however, were not finished. In February 1768, they forced the signing of a Polish-Russian treaty of alliance that confirmed the granting of liberty of worship to dissenting minorities and committed the king not to attempt any change in the Polish constitution without Russian consent.
Two days after the Diet in Warsaw dispersed, a group of conservative Catholic noblemen gathered in the southern Polish town of Bar, near the Turkish frontier, and declared themselves to be a Confederated Diet whose purpose was to defend Polish independence and the Catholic religion. Polish patriotism led to an ill-prepared and uncoordinated uprising. Russian troops marched south and easily dispersed this group of confederates, but other anti-Russian confederations arose elsewhere in Poland, and Catherine was forced to send more troops. The confederates appealed for support from Catholic Austria and from France; both sent money and officers to advise. Catherine responded by flooding the country with even more Russian troops. She realized that she had badly underestimated the strength of Polish Catholicism and national pride, and, to her surprise, she found herself enmeshed in a serious military campaign. The Poles were fighting, she wrote to Voltaire, “in order to prevent a quarter of their nation from enjoying civic rights.”
Catherine had succeeded in making Poland a vassal state with a puppet king, but she had also succeeded in arousing the hatred of the Poles, the alarm of Turkey, the anxiety of Austria, and even the nervousness of Prussia. Frederick had not signed a treaty with Russia in order to see the whole of Poland fall under Russian control.