The Canadian government agreed to provide a secret place named Camp X for the British to prepare Canadian spies. They also agreed that any Americans who showed up at the camp could also train as spies. It was the beginning of a shadow army—a group of men and women trained in military tactics who were not recognized as being a part of the military. A lot of the training for Camp X was in “night work.” Spies were taught how to sneak into military camps, railroad stations, and buildings to plant bombs. One special type of bomb had an electric eye that activated when the train went into a tunnel. The Camp X agents learned how to destroy power plants and poison water supplies. They learned how to ruin truck engines by putting sugar in the gas tanks and how to make explosives from simple household cleaning supplies.