On August 9, 1765, the wooden crucifix on a bridge in Abbeville was vandalized. Catholicism was then the state religion of France and the religion of the vast majority of the French public. The bishop of Amiens is said to have roused the furor of the faithful and asked churchgoers to reveal all they could about the case to the civilian judges, under pain of excommunication; although it is also said that he came to calm emotions but that the ceremony had the opposite effect. The church was obliged (under secular law) to make the proclamations looking for witnesses. Nobody actually revealed anything about the vandalism itself, but Du Maisniel de Belleval, a local judge who had quarreled with young La Barre, gathered damaging evidence against a group of friends (possibly not realizing his own son was part of the group). Three young men, Gaillard d'Etallonde, Jean-François de La Barre, and Moisnel were accused of not having removed their hats when a procession had passed, but numerous other blasphemies were revealed was well. La Barre's bedroom was searched and among his (mainly pornographic) prohibited books, Voltaire's Philosophical Dictionary was found - providing a pretext to blame the Philosophers for the young men's misbehavior.
Voltaire, at first horrified by the attention the affair drew to him, ended up defending La Barre's memory and helping d'Etallonde. The sentence was reversed by the National Convention during the French Revolution in 1794.