Where to find specialist books on this topic.
In the Law Library, these will be on Level 3, one floor above the entrance level to the law library. The floor is accessible via both stairs and lift.
In the public international law collection, browsing these shelf marks will be particularly fruitful
War & armed conflict Internat 750
Termination of war Internat 760
War crimes, trials etc Internat 580
Some works on the definition of war/armed conflict in international law which may be useful starting points are:
Article 2(4) UN Charter
"All Members shall refrain in their international relations from the threat or use of force against the territorial integrity or political independence of any state, or in any other manner inconsistent with the Purposes of the United Nations."
Finding books in the Bodleian
Subject search terms which may be useful include:
Aggression (International law)
Intervention (International law)
Just war doctrine
Self-defense (International law)
These are listed alphabetically by title.