An enemy seems powerful because he has a particular strength or advantage. Maybe it’s money and resources; maybe it’s the size of his army or of his territory; maybe, more subtly, it’s his moral standing and reputation. Whatever his strength might be, it is actually a potential weakness, simply because he relies on it: neutralize it and he is vulnerable. Your task is to put him in a situation in which he cannot use his advantage. In 480 B.C., when the Persian king Xerxes invaded Greece, he had a huge advantage in the size of his army and particularly his navy. But the Athenian general
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