As You Exit a Shopping Mall You Accidentally Run into Another

As you exit a shopping mall you accidentally run into another person and knock her down.As she leaps to her feet you begin to exchange words that escalate and you find yourself in a physical struggle with the other person.After receiving several blows from her,you retaliate by striking her on the head with your umbrella,knocking her unconscious and producing a large gash on her head.Discuss the principles of assault and battery as well as self-defence and what actions constitute each by defining them.Write a short decision on this case based on your knowledge and definition of the principles.