PENAL CODE OF BOTSWANA
PART I - General Provisions
General Rules as to Criminal Responsibility (ss 6-20)
16. Defence of person or property
Subject to the express provisions of this Code or any other law for the time being in force, a person shall not be criminally responsible for the use of force in repelling an unlawful attack upon his person or property or the person or property of anyone whom it is his moral or legal duty to protect if the means he uses and the degree of force he employs in so doing are no more than is reasonably necessary in the circumstances.
Self-defence - national proceedings
EDIT.