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They were given one of Military Intelligence (Research)'s uglier weapons, the Switch No. 8 AP – or as it was later know to soldiers in the Western Desert, the open 'castrator'. This booby-trap device was issued to the Resistance in parts of Scotland, but because of the way it worked it was never actually planted in training. A metal tube painted matt black, about the size of a fountain pen, the stick pencil contained a firing pin and a spring shaped like an umbrella catch. It was plugged vertically into the ground and a cartridge was inserted into it, nose upward, with the bullet protruding slightly out of the earth. The weight of a man’s foot on the bullets tip was enough to cause the spring to release the firing pin.