When France rumbles, the strategy and control of public order become a crucial political issue. Between protecting institutions and guaranteeing the right to demonstrate: the right balance is subtle. At the beginning of the Yellow Vests movement, at the end of 2018, the principles of "French-style" policing were shattered. The ransacking of the Arc Triomphe, the hundreds of injuries among the demonstrators and the forces of order mark the minds. How did it come to this? In order to understand, the film questions the so-called "legitimate" force and confronts them with the images of these confrontations.