In 1918, there was a big fight that happened in Kudus, which is a place in Indonesia. It's like when kids at school get into a big argument and start pushing each other.
But in Kudus, it was between people who were working for the Dutch government and people who lived there. The Dutch people wanted to make some new rules and the people who lived there didn't like them. It was kind of like when your parents tell you that you have to clean your room or go to bed early and you don't want to do it.
So, the people who lived in Kudus got really mad and started protesting. They threw rocks and broke things, kind of like when you get really mad and want to throw a tantrum. Unfortunately, some people got hurt and even died. It wasn't a good thing to do and it made a big mess.
After the fight, the Dutch government punished the people who were involved in the riot. It's like when you get in trouble for being naughty. It's important to remember that fighting is never a good thing and it's better to talk things out and find a solution.