Akira Kurosawa's original idea for the film was to make it about a day in the life of a samurai, beginning with him rising from bed, eat breakfast, go to his master's castle and ending with him making some mistake that required him to go home and kill himself to save face. Despite a good deal of research, he did not feel he had enough solid factual information to make the movie. He then pitched the idea of a film that would cover a series of five samurai battles, based on the lives of famous Japanese swordsmen. Hashimoto went off to write that script, but Kurosawa ultimately scrapped that idea as well, worrying that a film that was just "a series of climaxes" wouldn't work. Then, producer
Sôjirô Motoki found, through historical research, that samurai in the "Warring States" period of Japanese history would often volunteer to stand guard at peasant villages overnight in exchange for food and lodging. Kurosawa then came across an anecdote about a village hiring samurai to protect them and decided to use that idea. Kurosawa wrote a complete dossier for each character with a speaking role. In it were details about what they wore, their favourite foods, their past history, their speaking habits, their reaction to battle and every other detail he could think of about them. No other Japanese director had ever done this before.
