On 10 March 1793 he mounted the tribune of the Convention to denounce plots organized against the Girondins and reproached the Montagnards for filling the stands of the Assembly with their supporters.
However he escaped the proscription inflicted on his fellow petitioners; at the moment when his decree of arrest striking him proceeded to the vote, he absented himself from the Convention claimed that he needed to use the toilet, and was able to flee from Paris to Switzerland.
[2] After the Thermidorean Reaction, Gamon was recalled to the Convention, where he supported the reactionary policies of the majority; the restitution of the property of those who had been condemned under the Great Terror and severe punishment for those responsible for the Revolt of 1 Prairial Year III.
[2] Under the Directory, five departments elected Gamon to the Council of Five Hundred,[3] where he sat until the year VI among the moderates despite acquaintances with the royalists.
Two years later, he led a delegation from his department to congratulate Napoleon I, who appointed him general counselor of Ardeche in 1808, then president of the Court of Nimes in 1813.
During the session of this House he spoke only once after the battle of Waterloo, proposing the restoration of the Constitution of 1791, without indicating who he thought should take the Crown of France.