Chapter[ X. TERRAIN
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Item[ 31. Hence the saying: If you know the enemy and know
yourself, your victory will not stand in doubt; if you know
Heaven and know Earth, you may make your victory complete.
[Li Ch`uan sums up as follows: "Given a knowledge of three
things--the affairs of men, the seasons of heaven and the natural
advantages of earth--, victory will invariably crown your
battles."]
[1] See "Pensees de Napoleon 1er," no. 47.
[2] "The Science of War," chap. 2.
[3] "Aids to Scouting," p. xii.