How many movies have Isao Yamagata and Shunichi Yasuda collaborated on?

They have worked on 5 movies together! Their first movie together was Hawk of the North (1959) while their highest rated movie together was Case of Umon: The Nanbanzame Murders (1961). They have not worked together since The Yagyu Military Art: One Eyed Swordsman (1962). They are most known for their action films together.