After a brief change of pace for "Au Secours!" (1924), a comic film with Max Linder, Gance embarked on his greatest project, a six-part life of "Napoléon". Only the first part was completed, tracing Bonaparte's early life, through the Revolution, and up to the invasion of Italy, but even this occupied a vast canvas with meticulously recreated historical scenes and scores of characters. The film was full of experimental techniques, combining rapid cutting, hand-held cameras, superimposition of images, and, in wide-screen sequences, shot using a system he called Polyvision needing triple cameras (and projectors), achieved a spectacular panoramic effect, including a finale in which the outer two film panels were tinted blue and red, creating a widescreen image of a French flag. The original version of the film ran for around 6 hours. A shortened version received a triumphant première at the Paris Opéra in April 1927 before a distinguished audience that included the future General de Gaulle. The length was reduced still further for French and European distribution, and it became even shorter when it was shown in America. This was not the end of the film's career however. Gance re-used material from it in later films, and the restoration of the silent film at the beginning of the 1980s confirmed it as his best known work.