Kambei Builds a Defense Around Farmers, Terrain and Preparation
SPOILER!
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Kambei does not plan to have seven swordsmen stand in an open field and defeat an army of machines. The village is fortified, farmers are organized, traps and heavy defenses are prepared, and the Nobuseri are forced to fight on ground chosen by the defenders.
Why it worked
The Seven matter because they turn Kanna into a fighting system. The farmers are part of the defense rather than spectators waiting for heroes to save them.