TASK DEFINITION: Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.
PROBLEM: police action is a term for the use of military forces without declaring war.

SOLUTION: police action

PROBLEM: violence is when someone attacks someone else, often to get them to do something they do not want to do by making them feel pain or fear.

SOLUTION: violence

PROBLEM: the martial eagle ("polemaetus bellicosus") is a bird of prey.

SOLUTION:
martial eagle