4000bce - 399
400 - 1399
1400 - 1499
1500 - 1599
1600 - 1699
1700 - 1799
1800 - 1899
1900 - 1999
1. Declaration of war upon another State.
2. Invasion by its armed forces, with or without a declaration of war, of the territory of another State.
3. Attack by its land, naval or air forces, with or without a declaration of war, on the territory, vessels or aircraft of another State.
No political, military, economic or other considerations may serve as an excuse or justification for such actions, but exercise of the right of legitimate self-defense, that is to say, resistance to an act of aggression, or action to assist a State which has been subjected to aggression, shall not constitute a war of aggression.
International Conference on Military Trials : London, 1945
Report of Robert H. Jackson, United States Representative to the International Conference on Military Trials : London, 1945
International organization and conference series; II
European and British Commonwealth 1
Department of State Publication 3080
Washington, DC : Government Printing Office, 1949