During the War of the Spanish Succession in 1711, the Duke of Marlborough, head of the English army, wanted to destroy a key French fort, because it protected a vital thoroughfare into France. Yet he knew that if he destroyed it, the French would realize what he wanted—to advance down that road. Instead, then, he merely captured the fort, and garrisoned it with some of his troops, making it appear as if he wanted it for some purpose of his own. The French attacked the fort and the duke let them recapture it. Once they had it back, though, they destroyed it, figuring that the duke had wanted it
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