The Cantabrian Wars happened a long time ago when people were waging wars against each other. The Romans were a very powerful group of people living in Italy and they wanted to conquer other lands. The Cantabrian Wars were fought between the Romans and a group of people called the Cantabrians, who lived in a place called Cantabria, which is in now modern-day northern Spain.
The Romans wanted to take over the Cantabrian land, but the Cantabrians were not happy about this and didn't want to give up their land. So, they decided to fight against the Romans to protect their land.
The war lasted for a long time - almost 20 years - and it was very difficult for both sides. The Romans had better weapons and were more organized, but the Cantabrians knew the land better and were very determined to protect it.
At first, the Romans were winning and they conquered many parts of Cantabria, but the Cantabrians kept fighting back. They used guerrilla tactics, which means they would attack the Romans and then quickly run away and hide in the mountains.
But the Romans didn't give up either. They sent more and more soldiers to fight against the Cantabrians. Eventually, the war ended when the Romans finally defeated the Cantabrians and took over their land.
Although the Cantabrians lost the war, they became famous for their bravery and fighting skills. Some historians even say that the Cantabrian Wars were one of the most difficult wars the Romans ever fought.