 Nyorai kupfuurira kweiyi ndima - Muna September 1792, Couthon akasarudzwa kuNational Convention. Paakashanyira Flanders, kwaakatsvaka kurapwa nokuda kwehutano hwake, akasangana ndokuita ushamwari naCharles François Dumouriez uye gare gare akanyora kurumbidza kwake kuMusangano uye akataura nezvake se murume anokosha kwatiri. Ukama hwake naDumouriez kwenguva pfupi hwakaita kuti Couthon afunge kujoina bato reGirondist reMusangano, asi mushure mekunge vavhoti veGirondist veDare reBumbiro rakaramba Couthon chigaro muDare muna Gumiguru 1792, akazopedzisira azvipira kuMontagnards neboka remukati rakaumbwa rakakomberedza Maximilien Robespierre; vese vakagovana maonero mazhinji. Couthon akava mutsigiri anoshingaira wevaMontagnards uye aiwanzodzokorora pfungwa dzavo. Pakutongwa kwaLouis XVImuna December 1792, akataura zvinonzwika achipesana nechikumbiro chevaGirondist chekuita referendamu uye akaenderera mberi achivhotera mutongo werufu pasina kukwidza nyaya. Musi wa 30 May 1793, Couthon akagadzwa semunyori, musi wa 10 July senhengo yeKomiti yePublic Safety, kwaaizoshanda pamwe chete naRobespierre naSaint-Just mukugadzira hurongwa hwematongerwo enyika uye mapurisa. Mazuva matatu asvika pachinzvimbo ichocho, Couthon akanga ari wokutanga kukumbira kusungwa kwavaGirondist vakanga varambidzwa. 