 For three days over the weekend of Pentecost L'Herbier was allowed to take over the Paris Bourse and employed 2000 extras in the stock-exchange scenes.Still more challenging was a night-time scene in the Place de l'Opéra which had to be specially lit and filled with people to convey the feverish excitement of waiting for news of Hamelin's flight.For his principal cameraman L'Herbier chose Jules Kruger who had devised the elaborate camerawork of Gance's "Napoléon".