Pt. I. The Legal Nature of War. Ch. 1. What Is War? Ch. 2. The Course of War -- Pt. II. The Illegality of War. Ch. 3. An Historical Perspective of the Legal Status of War. Ch. 4. The Contemporary Prohibition of the Use of Inter-State Force. Ch. 5. The Criminality of War of Aggression. Ch. 6. Controversial Consequences of the Change in the Legal Status of War -- Pt. III. Exceptions to the Prohibition of the Use of Inter-State Force. Ch. 7. The Concept of Self-Defence. Ch. 8. The Modality of Individual Self-Defence. Ch. 9. Collective Self-Defence. Ch. 10. Collective Security