On 20 September, the French army won a stunning victory over the Prussians at Valmy. Emboldened by this, on 22 September the Convention replaced the monarchy with the French First Republic and introduced a new calendar, with 1792 becoming "Year One". The next few months were taken up with the trial of "Citoyen Louis Capet", formerly Louis XVI. While the convention was evenly divided on the question of his guilt, members were increasingly influenced by radicals centred in the Jacobin clubs and Paris Commune. The Brunswick Manifesto made it easy to portray Louis as a threat to the Revolution, apparently confirmed when extracts from his personal correspondence were published showed him conspiring with Royalist exiles serving in the Prussian and Austrian armies.