Okay, so bataireacht is a type of Irish stick fighting that people used to do a long time ago in Ireland. It's like playing with toy swords, but with real sticks that you use to hit each other. But don't worry, they didn't try to hurt each other too badly!
Before they started hitting each other, the people would first get into a stance, kind of like a superhero pose. Then they would swing their sticks around in the air, like they were drawing pictures with them. This was called "showing off" and it was like saying, "Hey, look how good I am with my stick!"
Once they were ready to start, they would hit each other's sticks back and forth, trying to land a hit on their opponent. It was like a really fast game of catch, but with sticks instead of a ball. They would also move around a lot, trying to dodge and weave like they were dancing.
Bataireacht was really popular a long time ago, but not so much anymore. Today, people usually practice it as a sport or for fun, not for fighting. It's a cool way to learn some traditional Irish culture and get some exercise too!