By altering his arrangements and changing his plans,
Wang Hsi thinks that this means, not using the same stratagem
twice. He says: 已行之事已施之謀當革易之不可再之.
he keeps the enemy without definite knowledge.
Note that 人 denotes the _enemy_, as opposed to the 士卒 of § 36.
Capt. Calthrop, not perceiving this, joins the two paragraphs into
one. Chang Yü quotes 太白山人 as saying: 兵貴詭道者非止詭敵也抑詭我
士卒使由而不使知之也 “The axiom, that war is based on deception,
does not apply only to deception of the enemy. You must deceive
even your own soldiers. Make them follow you, but without letting
them know why.”
By shifting his camp and taking circuitous routes, he prevents the
enemy from anticipating his purpose.
Wang Hsi paraphrases 易其居 as 處易者 “camp on easy ground,” and
Chang Yü follows him, saying: 其居則去險而就易. But this is an
utterly untenable view. For 迂其途, cf. VII. 4. Chia Lin, retaining
his old interpretation of those words, is now obliged to explain
易其居 as “cause the enemy to shift his camp,” which is awkward in
the extreme.