Whats this classic Martial Arts movie?

ok, im saying this to the best of my recollection (i saw as a kid). It is an 80s possibly late 70s movie. There is this guy(s) fighting different groups of ninjas. There are different levels of ninjas as they wear different colors. I even remember one ninja hiding in/behind a tree and this guy cuts it in half killing that ninja in half HAHA and I want to say that it has a long movie title as in many words? PLEASE HELP ME FIGURE IT OUT