This Simple Sabotage Field Manual, a genuine guide from the Second World War, states that its purpose is to "e; characterize simple sabotage, to outline its possible effects, and to present suggestions for inciting and executing it. "e; Among the other fine pieces of advice in this handy volume, one is encouraged to "e; switch address labels on enemy baggage"e; , "e; let cutting tools grow dull"e; , "e; forget to provide paper in toilets"e; , and "e; change sign posts at intersections and forks; the enemy will go the wrong way and it may be miles before he discovers his mistakes. "e;