Christian Henderson is Professor of International Law at the University of Sussex. He has published several books and many peer-reviewed journal articles on the use of force in international law and is co-editor-in-chief of the Journal on the Use of Force and International Law.

'The appearance of a new edition of Christian Henderson's clear work on the law on the use of force is most welcome. This second edition has been thoroughly updated, taking account of the many developments since the first edition, including the current war in Ukraine. It is a reliable and informative guide, for academic and practitioner alike, on a central question of modern international law' Sir Michael Wood, Twenty Essex, London

• Part I. The Prohibition of the Threat or Use of Force: 1. The general breadth and scope of the prohibition; 2. The meaning of 'force'; Part II. The Use of Force in the Context of Collective Security: 3. The use of force under the auspices of the United Nations; 4. Issues in relation to authorisation by the United Nations Security Council; 5. United Nations Peacekeeping and the use of force; Part III. The Use of Force in Self-Defence: 6. General aspects of the right of self-defence; 7. Preventative self-defence; 8. The use of force against non-state actors; Part IV. Forcible Intervention in Situations of Civil Unrest: 9. Consent to intervention and intervention in civil wars; 10. The doctrine of humanitarian intervention; Conclusions.

Christian Henderson is Professor of International Law at the University of Sussex. He has published several books and many peer-reviewed journal articles on the use of force in international law and is co-editor-in-chief of the Journal on the Use of Force and International Law.

'The appearance of a new edition of Christian Henderson's clear work on the law on the use of force is most welcome. This second edition has been thoroughly updated, taking account of the many developments since the first edition, including the current war in Ukraine. It is a reliable and informative guide, for academic and practitioner alike, on a central question of modern international law' Sir Michael Wood, Twenty Essex, London

• Part I. The Prohibition of the Threat or Use of Force: 1. The general breadth and scope of the prohibition; 2. The meaning of 'force'; Part II. The Use of Force in the Context of Collective Security: 3. The use of force under the auspices of the United Nations; 4. Issues in relation to authorisation by the United Nations Security Council; 5. United Nations Peacekeeping and the use of force; Part III. The Use of Force in Self-Defence: 6. General aspects of the right of self-defence; 7. Preventative self-defence; 8. The use of force against non-state actors; Part IV. Forcible Intervention in Situations of Civil Unrest: 9. Consent to intervention and intervention in civil wars; 10. The doctrine of humanitarian intervention; Conclusions.