The anti-clericalism during the French Revolution initially began with attacks on church corruption and the wealth of the higher clergy, an action with which even many Christians could identify, since the Roman Catholic church held a dominant role in pre-revolutionary France. During a two-year period known as the Reign of Terror, the episodes of anti-clericalism grew more violent than any in modern European history. The new revolutionary authorities suppressed the church; abolished the Catholic monarchy; nationalized church property; exiled 30,000 priests and killed hundreds more. Many churches were converted into "temples of reason," in which services were held. There has been much scholarly debate over whether the movement was popularly motivated. As part of the campaign to dechristianize France, in October 1793 the Christian calendar was replaced with one reckoning from the date of the Revolution, and Festivals of Liberty, Reason and the Supreme Being were scheduled. New forms of moral religion emerged, including the deistic Cult of the Supreme Being and France's first established state sponsored atheistic Cult of Reason, with all churches not devoted to these being closed. In April and May 1794, the government mandated the observance of a festival of the Cult of the Supreme Being. When anticlericalism became a clear goal of French revolutionaries, counter-revolutionaries seeking to restore tradition and the Ancien Régime took up arms, particularly in the War in the Vendée (1793 to 1796). Local people often resisted dechristianisation and forced members of the clergy who had resigned to conduct Mass again. Eventually, Maximilien Robespierre and the Committee of Public Safety denounced the dechristianization campaign and tried to establish their own religion, without the superstitions of Catholicism.