In this paper I shall examine a variety of situations in which human agents make use of force. Section I will be concerned with the use of force in medical contexts, Section Ii with the use of force in defence of property, and Section in with the use of force in resolving international disputes. I shall argue that the boundary between what is and is not morally permissible needs to be, drawn more stringently than is commonly supposed. While agreeing that in some medical contexts and in some situations where defence of property is involved the use of force may be necessary and even morally required, I shall suggest that in the absence of any suitably constituted world court the use of force in attempting to resolve international disputes creates a morally different situation.