Two Champions of Death (1980).
I honestly don’t know quite where to begin. The Wu Tang are fighting Shaolin, but it’s all kind of hidden inside politics. There are about a million named characters and, they’re all really arrogant so it’s quite hard to tell which team they’re on (and who the ‘good team’ are) until some considerable distance through the movie when the Wu Tang attack a wedding party in revenge for the death in single combat of one of their own (to be fair his scrotum was pulled off, I’d be a bit miffed if one of my relatives was killed like that). There are some female allowed to fight in this movie but it’s made very clear that they’re definitely ‘weak’.
The ending is very reminiscent of The Hateful Eight.