2013, No. 10 Crimes 17 (b) the person believes on reasonable grounds that he or she cannot otherwise preserve the person under his or her protection from death or grievous bodily harm; and (c) the force the person uses is no more than is necessary to prevent the assault or repetition of it. 18. Defence of dwellinghouse - A person in a peaceable possession of a dwellinghouse, and everyone lawfully assisting that person or acting by his or her authority, is justified in using such reasonable force as is necessary to prevent the forcible breaking and entering of the dwellinghouse by any person if the person believes, on reasonable grounds, that there is no lawful justification for the breaking and entering. 19. Defence of land or building - A person in peaceable possession of any land or building, and any person lawfully assisting the person or acting by his or her authority, is justified in using reasonable force to prevent any other person from trespassing on the land or building or to remove the other person from the land or building, if he or she does not strike or do bodily harm to the other person. 20. Defence of moveable property-(1) A person in actual and unchallenged possession of any moveable property, or who has a claim of right to that property, and any person lawfully assisting that person, is justified in using reasonable force to resist the taking of that property by any other person, or to retake it. (2) Despite subsection (1), no person is justified, or excused from criminal liability if in the defence of moveable property the person strikes or causes bodily harm to any person. 21. Excessive force - A person authorised by law to use force is criminally responsible for any excess, according to the nature and quality of the act that constitutes the excess, and any consequence of that force.