rent Heaven and Earth if you can find it (good luck)...and NOT the Tommy Lee Jones Vietnam wartime romance flick...Heaven & Earth is a subtitled Japanese film has some of the best battles scenes and some great duels.
Also, the movie RAN (another Japanese film, this one by Akira Kurosawa) has some intense, graphic battles and sieges.
Lastly, any of the older black and white Kurosawa films (Seven Samurai, Kagemusha, etc.) have some well researched/executed swordsmanship sprinkled in with all the artsy stuff.
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Condition Yellow: for a longer, happier life.