Death that occurs violently and strikes when one is in full control of emotions and senses is most dreaded.
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Sun Tzu also said that, once a general was appointed, it was his duty to carry out his mission, even if the king protested.
So much for campaigning in flat country.
All we need do is attack some other place that he will be obliged to relieve.
However, you cannot force your enemy to take a stance.