"In wartime they attack a part of the body that other weapons cannot reach in an attempt to affect the way which participants perform on the field of battle." (
Therefore the demonstrated tools refer to political propaganda in the two World Wars.
Propaganda has the ability to change a war, a natural evil, into a so-called "just" war. Violence then is supposedly defense, no more aggression.
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Though Sergei Eisenstein (1898-1948) made only seven films in his entire career, he was the USSR's most important movie-conductor in the 1920s and 1930s. His typical style, putting mountains of metaphors and symbols into his films, is called the "intellectual montage" and was not always understood or even liked by the audience. Still, he succeeded in mixing ideological and abstract ideas with real stories. His most famous work was The Battleship Potemkin (1923).