Bastille, a prison located on the east side of Paris, was attacked by Parisian revolutionaries (people in the third estate of France). The military governor of Bastille, Bernard-René Jordan de Launay, had been prepared to fight with the French Revolution in mind. Bastille surrenders after too many Parisians show up, and Bastille is captured and Launay is murdered. This marked the end of the ancien régime (the political and social system of the Kingdom of France)
and gave fuel to the French Revolution.