Documentaries began to bridge political and social affiliation and message and at the same time explore artistic expression and style in cinematography. Meanwhile in Germany, documentaries were used as a political tool with cinematic innovations with Leni Riefenstahl's Triumph of the Will (1935) and Olympia (1938).
World War II (1939-1945) introduced newsreels and combat camera crews, as well as quick, fast-paced