Okay kiddo, let me tell you what happened at the Moncada Barracks in Cuba a long time ago.
Imagine you and your friends are playing together and someone comes and takes away your toys, your food, and your house. That's what happened to the people of Cuba a long time ago. They were very unhappy because they were not free to do what they wanted and they didn't have enough food to eat.
One day, a group of people in Cuba decided they wanted to change things and make their country better. They decided to take over a place called the Moncada Barracks where the Cuban army kept their weapons.
But here's where things went wrong. The people who were trying to take over the barracks were not very organized and didn't have a good plan. They thought they could surprise the soldiers guarding the barracks, but the soldiers were ready for them. A lot of people got hurt and many were killed.
Although the takeover of the Moncada Barracks was not successful, it was an important event in Cuban history. It helped to start the Cuban Revolution, which eventually led to the country becoming free and independent.
So, in summary, the Moncada Barracks was a place where the Cuban army kept their weapons. Some people tried to take it over to make their country better, but it didn't work out. It was an important moment in Cuban history that helped lead to freedom and independence.