Depicts the bloody siege of the fortress of Port Arthur, one of the most strongly fortified positions in the world, during the Russo-Japanese War of (1904 - 1905). In the story dominated the character Lt Takeshi Kogyo (Teruhiko Aoi), teachers, and a reserve officer who became commander of the platoon and later company. At the same time monitors the conduct of the army commander general Nogi (Tatsuya Nakadai), which was commissioned of the emperor Matsuhito (Toshirô Mifune) to the conquest of the fort.
A nameless ronin, or samurai with no master, enters a small village in feudal Japan where two rival businessmen are struggling for control of the local gambling trade. Taking the name Sanjuro Kuwabatake, the ronin convinces both silk merchant Tazaemon and sake merchant Tokuemon to hire him as a personal bodyguard, then artfully sets in motion a full-scale gang war between the two ambitious and unscrupulous men.