Schleswig-Holstein Question
The film then follows the plot of the book, which itself largely derives from "The Prisoner of Zenda". Flashman is forced by Otto von Bismarck to impersonate a Danish prince, who is about to marry a German princess (Britt Ekland). Bismarck exacts this retribution partly in revenge for his humiliation at the hands of Flashman in London; Flashman stole Bismarck's mistress Lola Montez, then manoeuvred him into boxing against a professional boxer, John Gully (played by Henry Cooper), at a house party. Bismarck does not wish the Princess to marry a Dane, since this may tilt the balance on the Schleswig-Holstein Question and interfere with his plans for a united Germany.