“In antiquity those that excelled in warfare first made themselves unconquerable51
in order to await [the moment when] the enemy could be conquered.
“Being unconquerable lies with yourself; being conquerable lies with the enemy.
“Thus one who excels in warfare52
is able to make himself unconquerable, but cannot necessarily cause the enemy to be conquerable.
“Thus it is said a strategy for conquering the enemy can be known but yet not possible to implement.
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“One who cannot be victorious assumes a defensive posture; one who can be victorious attacks. In these circumstances by assuming a defensive posture, ...