For Russians of director Sergei Eisenstein's generation, the experience of the First World War was overtaken by the revolution of 1917, which took Russia out of the war and plunged it into a bitter civil war from which the infant Bolshevik Soviet state emerged. Eisenstein seized the opportunity of serving in the Red Army to become a radical theatre director, which led him into film as part of the first generation of Soviet film-makers, who would astonish the world in the late 1920s with films like The Battleship Potemkin and October. These films would shape the cultural and political landscape of the interwar years - championed by those who wanted to condemn the Great War as an imperialist struggle, and also foreshadowing the Second World War. Film historian Ian Christie untangles this complex story.