Because of its anti-Russian theme the film was pulled from release in 1939 following the Molotov–Ribbentrop Pact. It was rereleased in December 1941, shortly after the pact was broken and Germany and the Soviets were at war.[1]
The film is loosely connected to the Prussian film cycle of historical epics.
Hull, David Stewart (1969). Film in the Third Reich: A Study of the German Cinema, 1933–1945. Berkeley: University of California Press. ISBN978-0-520-01489-3.