Lacordaire and Montalembert departed immediately, but Lamennais stayed on until Gregory's letter to the Polish bishops, which denounced the Polish revolution against the Tsar, dashed his last hopes. Gregory thought the Polish revolutionaries were seeking to undermine Russian Tsar Nicholas I's efforts to support the Catholic royalist cause in France by forcing him to divert his troops to suppress the uprising in Poland. While staying in Munich, Lamennais received the 1832 encyclical "Mirari vos", which condemned religious pluralism in general and certain of Lamennais's ideas advanced in "L'Avenir" without mentioning his name. After this, Lamennais and his two lieutenants declared that out of deference to the pope they would not resume the publication of "" and dissolved the Agence générale as well.