Rare card
Double-Cross System
- Value
- 50 W
- Attack
- 258
- Defence
- 206
- Players
- 0
The Double-Cross System or XX System was a World War II counter-espionage and deception operation of the British Security Service (MI5). Nazi agents in Britain – real and false – were captured, turned themselves in or simply announced themselves, and were then used by the British to broadcast…
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