He adopted revolutionary ideas, and became a curé of the Constitutional Church in the department of Pas-de-Calais, where he was later elected as a député suppléant to the convention.
[1] He was sent as a representative on missions into the departments of the Somme and Pas-de-Calais, where he showed great severity in dealing with offences against revolutionaries (8th Brumaire, year II.
He was tried before the criminal tribunal of the Somme, condemned to death for abuse of his power during his mission, and executed at Amiens on the 24th Vendémiaire in the year IV.
Whatever Le Bon's offences, his condemnation was to a great extent due to the violent attacks of one of his political enemies, Armand-Joseph Guffroy; and it is only just to remember that it was owing to his courage that the town of Cambrai was saved from falling into the hands of the Austrians.
[1] During his stay in the north he chased many nobles, most of them condemned for treason and executed by guillotine[2]