To dream that you are attacking someone denotes to your aggression, anger, frustration and desperation that havent been expressed in waking life. If you attack a certain person you know, it means that you have some unsolved problems with him or her. If you attack in order to protect yourself, you will have to deal with unpleasant people or situations in your waking life.
Attacking dream meaning
Read more about dreaming of Attacking in other dream meanings interpretations.