18. Hence the saying: If you know the enemy and know
yourself, you need not fear the result of a hundred battles. If
you know yourself but not the enemy, for every victory gained you
will also suffer a defeat.
[Li Ch`uan cites the case of Fu Chien, prince of Ch`in, who
in 383 A.D. marched with a vast army against the Chin Emperor.
When warned not to despise an enemy who could command the
services of such men as Hsieh An and Huan Ch`ung, he boastfully
replied: "I have the population of eight provinces at my back,
infantry and horsemen to the number of one million; why, they
could dam up the Yangtsze River itself by merely throwing their
whips into the stream. What danger have I to fear?"
Nevertheless, his forces were soon after disastrously routed at
the Fei River, and he was obliged to beat a hasty retreat.]
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