We don't need to go that far.Yeah, I also remember hearing stories of traditional Jujutsu schools fighting each other constantly in old Japan. Like if you opened up a new dojo, the other schools would storm it and beat the crap out of you and your students. Also the prominent schools would have their best students fight in duels to see which school was superior.
When the Gong Li system master Wang Feng-Ting open a Shuai-Chiao school in Taiwan back in the 70th, 2 Shuai-Chiao guys from another school went to visit that school. They first pretended to be just beginners, sat on the corner, and watch. When the teaching assistant (the school master wasn't there) asked if they would like to train with them, those 2 guys not only beat up all the students, they also beat up the assistant instructor. The assistant instructor went to tell the school master. The school master invited both guys to his house, pull them some tea with glass powder in it. Both guys had blood came out of their butts for the next 3 months. That school soon shut down.