It all started when Robespierre declared terror. However they did not know that this event would last for almost two whole years. There were over 18,500-40,000 people executed in the Reign of Terror. Yet the terror was to fight enemies of the revolution. The leader of the Reign of Terror was a man by the name of Maximilien Robespierre, and he was also the leader of the Committee of Public Safety. I believe that this terror went against the declaration because Robespierre took over and turned the country into distress.