T2: The Duellists - 1977. If you want to see textbook examples of all of the different 'fashionable' styles of dueling during the Napoleonic era, this is your film. It's also the only movie I've watched that seems to recreate authentic combat - a cavalry sabre is a heavy thing and it really takes a physical toll after just a few minutes of adrenaline fueled activity - and there isn't any of the ridiculous swashbuckling flourish you usually see in the movies.
The Duellists, Ridley Scott's first film. Extraordinary film about two men who engage in a series of duels of the years. It is painterly and beautifully acted, with explosive bursts of authentic, bloody swordplay.