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One of the more powerful attacks of the Spy and Cyber Ninja is the spy attack. If successful, the Spy attack reveals everything about the city - what is being built, how many people live there, how many military units are garrisoned, how much Food, Gold and Production are produced.
This information is vital for preparing to attack a city. However, Spies and Cyber Ninjas have a chance of being captured if they are not successful.