Kon Ichikawa's 47 Ronin - Region 1 DVD

When a beloved feudal lord is forced to commit seppuku (ritual suicide) for assaulting a rude court official, 47 of his loyal retainers vow to avenge his death for the sake of honor. After patiently waiting and planning for over a year, they launch an epic assault that culminates in a final act of vengeance and, inevitably, their own inescapable demise.