books.google.co.nz - "All the authorities on the subject, I believe, are collected in this excellent book." Sir Frederick Pollock, The Genius of the Common LawAlthough it is not known exactly when trial by combat, battle, or duel began as a method of conflict resolution, its origin certainly goes back before the feudal era....http://books.google.co.nz/books/about/Trial_by_Combat.html?id=okQ6kZZZGCkC&utm_source=gb-gplus-shareTrial by Combat