11 Therefore, if they desire to show Us their submission and their devotion, let the Catholic men of France struggle for the Church in accordance with the directions We have already given them, that is to say, with perseverance and energy, and yet without acting in a seditious and violent manner. It is not by violence, but by firmness, that, fortifying themselves in their good right as within a citadel, they will succeed in breaking the obstinacy of their enemies; let them well understand, as We have said and as we repeat that their efforts will be useless unless they unite in a perfect understanding for the defense of religion.
Source: Gravissimo Officii Munere (Vatican.va)