Okay kiddo, back in 1854, in a place called Epirus (which is now part of Greece), some people got really upset with the way they were being treated by the people in charge. They didn't like how they were being forced to pay high taxes and not getting any say in how things were run.
So, they decided to revolt, which means they wanted to try and fight back against the people in charge and create their own rules. They gathered together and started protesting, which is like when you tell someone you're not happy with the way they're treating you.
But, the people in charge didn't like this at all and they tried to stop the revolt by sending soldiers to the area. The people who were revolting didn't have a lot of weapons or training, so they couldn't really fight back, and eventually the soldiers were able to stop the revolt.
It was a really sad situation because a lot of people were hurt and killed, and things didn't get better for the people in Epirus for a long time. But sometimes when people feel like they're being treated unfairly, they feel like they have to stand up for themselves and make a change, even if it's really hard.