After Summer, Ogawa Pro attempted a more epic scale with Winter in Sanrizuka. It was roundly criticised as a failure. In the wake of this criticism, the collective became increasingly militant. They decided to make a quick and dirty report from the front, calling it a "bullet film." They shot this agit-prop film in three days, when 2,500 protestors battled 6,500 police. Even the school had been let out so children could participate in the action.
https://www.imdb.com/fr/title/tt0241918/
Mark Nornes wrote:
Sanrizuka—The Three Day War is a creditless, agit prop cine-tract shot over the course of three days. As the unilateral surveying of the construction site pushed into its final phase, the farmers and students undertook a massive attempt to obstruct its progress. This film records these days of combat between twenty-five hundred protestors and sixty-five hundred riot police. School had even been let out so children could participate in the action.