Seven Samurai (七人の侍 Shichinin no Samurai) is a 1954 Japanese Jidaigeki adventure film co-written, edited, and directed by Akira Kurosawa. The story takes place in 1586 during the Warring States Period of Japan. It follows the story of a village of farmers that hire seven ronin (masterless samurai) to combat bandits who will return after the harvest to steal their crops. Wikipedia
(Kambei is considering the farmer's offer)
Kambei Shimada: It's impossible.
Katsushiro: Sir! Why not arm them with...?
Kambei Shimada: I thought of that, too.
Katsushiro: But sir.
Kambei Shimada: (pointedly) This would not be a game. A band of forty bandits! Two or three "samurai" could accomplish nothing. Defense is harder than offense. Mountains in the back of the village?
Kambei Shimada: Can horses get over them?
Kambei Shimada: Fields in front. The village is wide open to horsemen... until the fields are flooded. One guard for each direction takes four. Two more as a reserve. You'll need at least... seven, including me.