Dismembering is the act of cutting or injuring someone so that they can't be fully or accurately killed. It can also refer to the process of cutting up a body so that the different parts can be identified.
Dismember means to cut or tear apart something. When you dismember a body, you are cutting it into pieces so that it can be identified.
When something is invulnerable, it is very resistant to attack or damage. This means that it is very difficult for someone to hurt or defeat it.
To exterminate something is to kill it all. You can exterminate a whole group of people, or you can exterminate a single person.
A swarm is a large group of insects, usually bees, wasps, or hornets. Swarms can be dangerous, because they are usually clustered together and they can be very aggressive.
Eradicated means to destroy or to remove something from existence. When the Romans eradicated the Carthaginians, they were able to conquer their land and control it.
To harbor someone is to care for them and to protect them from the law. If you harbor someone who is wanted by the police, you are responsible for hiding them and keeping them safe.
When people want to protect themselves or their property, they might erect barriers. These barriers can be anything from fences to walls.
Overrunning means to overrun or to get the better of someone. If the enemy overran our position, they got the better of us and we lost the battle.