Trial by Battle

Trial by combat (also wager of battle, or judicial duel) was a method of Germanic law to settle accusations in the absence of witnesses or a confession, in which two parties in dispute fought in single combat; the winner of the fight was proclaimed to be right. In essence, it is a judicially-sanctioned duel. It remained in use throughout the European Middle Ages and gradually disappeared in the 16th century.
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An ancient dispute resolution method: fighting it out. - (read more on Trial by Battle)