How did Attila the Hun affect the Roman Empire in the middle of the 5th century

Question: How did Attila the Hun affect the Roman Empire in the middle of the 5th century !?
Best Answer - Chosen by Asker:

He scared the **** out of them!. What is surprising is that he failed to follow through in the end!. He could have taken over the empire at one point and made himself Caesar!.Www@QuestionHome@Com