Sound films
After a transitional film, Nuits de princes, shot as a silent picture but given a complete soundtrack of music, songs and sound-effects, L'Herbier undertook L'Enfant de l'amour (1929), which, like many other early ventures in sound film, was an adaptation of a stage play. This was the first fully talking picture to be made in a French studio. In addition to the technical problems presented by the heavy new sound cameras, L'Herbier was also required to make the film simultaneously in three different language versions (French, English and German) which meant that several actors had to be used in some of the roles. The film was sufficiently successful to attract other similar offers, but L'Herbier felt the loss of his independence of action, and after making two detective films based on books by Gaston Leroux, Le Mystère de la chambre jaune (1930) and Le Parfum de la dame en noir (1931), he withdrew from film-making for two years and returned to writing. In 1933, fearing that he was losing touch with the film business, he returned to make several more versions of stage plays, L'Épervier, Le Scandale and L'Aventurier, all of which enjoyed commercial popularity but gave little scope for the kind of cinematic invention that he sought.
L'Herbier's most successful film of the 1930s was Le Bonheur (1934), ("a miraculous conjunction of talents"), adapted from a play by Henri Bernstein, with Charles Boyer and Gaby Morlay in the leading roles. During filming, L'Herbier was injured when a camera fell on him, and he consequently lost the sight of one eye. He began a court action against the producers Pathé, claiming their civil responsibility, and the eventual judgment of the case (1938) in his favour recognised for the first time in French law the right of the director to be considered as an author of his film, rather than merely as an employee of the company. This marked an important stage in L'Herbier's lifelong battle for greater recognition of filmmakers as creative artists.
Between 1935 and 1937, L'Herbier directed seven features, including a trio which were characterised by their patriotic spirit, Veille d'armes (1935) (depicting the French navy), Les Hommes nouveaux (1936) (Maréchal Lyautey's pacification of Morocco), and La Porte du large (1936) (the navy again). Made during a period of intense political conflict between the left and the right in France, these films, by L'Herbier's own admission, represented a split in his own politics, which set his socialist sympathies against his impatience with the anti-militarism of the Front Populaire.
After trying to revive his own production company, this time under the name Cinéphonic, to produce some short documentaries, l'Herbier tried to develop more satisfactory material for himself in a series of dramatised histories which he called "chroniques filmées". The three which he completed before the outbreak of World War II were La Tragédie impériale (1938), about Tsar Nicholas II and Rasputin, Adrienne Lecouvreur (1938), filmed at the UFA studios in Berlin, and Entente cordiale (1939), which used the life of Edward VII to demonstrate the affinities between France and Britain; (its première in April 1939 took place in the wake of the German invasion of Czechoslovakia).
The outbreak of war in 1939 did not immediately interrupt L'Herbier's film-making, and in the spring of 1940 he was at the Scalera studios in Rome shooting a long-cherished project, La Comédie du bonheur, but the imminent entry of Italy into the war alongside Germany forced him to return to France before the film was fully completed (though it was subsequently released).
After the German occupation of France in 1940, L'Herbier worked with other filmmakers to salvage the French film industry and to protect the jobs of its technicians. He went on to direct four films before the Liberation, the most successful of which was La Nuit fantastique (1942). This "realistic fairy tale" was very different from the prevailing style of French film production, and it allowed him to return to the style of visual experimentation which had characterised his silent films – to which he could now add innovative uses of the soundtrack. It did much to restore his critical reputation at least temporarily.
In the post-war period, L'Herbier made one further return to the "chronique filmée" with L'Affaire du collier de la reine (1946), but otherwise his remaining films as director were fairly conventional literary adaptations, and his creative career in the cinema concluded with Les Derniers Jours de Pompei (1950) and Le Père de mademoiselle (1953). In the 35 years since his début in 1918, he completed 14 silent and 30 sound feature films.