Samurai Spy

Samurai Spy , Ibun Sarutobi Sasuke? , also known as Spy Hunter, is a 1965 film directed by Masahiro Shinoda, based on a novel by Koji Nakada. The legendary samurai Sasuke Sarutobi tracks the spy Nojiri, while a mysterious figure named Sakon leads a band of men on their own quest for the wily Nojiri. Soon no one knows just who is who and what side anyone is on. Made during the height of the cold war, the film follows the lives of spies caught up in the power struggles of their times.

Source: Wikipedia