13 Assassins (2010, Movie)

This movie is about an evil tyrannical Shogun who kills people for any reason whether they are men or women makes no difference to him. So 13 assassins who are Samurai rise up against him to stop his meaningless murders. The first half is spent recalling said brutality in gruesome detail, and the second half is spent returning all that brutality upon the perpetrator. The 45-minute samurai battle that is the capstone is the most realistic and elegant portrayal of how such an event could pass, and alone is worth the viewing for the superb choreography and continuity.