War Treason Definition: Acts committed within the lines of a belligerent as are harmful to him and are intended to favour the enemy. Oppenheim's 1952 doctrine, International Law, A Treatise defined war treason as follows:"[S]uch acts ... committed within the lines of a belligerent as are harmful to him and are intended to favour the enemy."Zengel writes that the judgment of the British-Norway Military Court in Re Nicholaus von Falkenhorst:"... commando operations behind enemy lines would probably be punishable as war treason if performed by members of a belligerent's armed forces while wearing civilian clothes."REFERENCES:Oppenheim, L., International Law, A Treatise, 7th Ed., Volume 2, §255 (1952)Re Nicholaus von Falkenhorst, Case #61, British Military Court, Brunswick, XI Law Reports of Trials of War Criminals 18; at 27 (1949)Zengel, Patricia, Assassination and the Law of Armed Conflict, 43 Mercer L. Rev. 615 (1991-1992) Categories & Topics: Military Law Dictionary Find you are constantly looking up definitions? Try our search provider (works in most modern browsers) If you find an error or omission in Duhaime's Legal Dictionary, or if you have legal term suggestion, we'd love to hear from you!