Seven Samurai is streaming on HBO Max. It's also free to watch on Kanopy, Shout! Factory TV, Plex and others. You can also rent or buy it digitally.
A samurai answers a village's request for protection after he falls on hard times. The town needs protection from bandits, so the samurai gathers six others to help him teach the people how to defend themselves, and the villagers provide the soldiers with food.