九地篇 NO.2：

2.古之善用兵者，能使敌人前后不相及，众寡不相恃，贵贱不相救，上下不相收，卒离而不集，兵合而不齐。

合于利而动，不合于利而止。

敢问:“敌众整而将来，待之若何?”

曰：“先夺其所爱，则听矣。”

兵之情主速，乘人之不及,由不虞之道，攻其所不戒也。

这句啥意思：

从前善于指挥作战的人，能使敌人前后部队不能相互策应，主力和小部队无法相互依靠，

官兵之间不能相互救援，上下级之间不能互相联络，士兵分散不能集中，合兵布阵也不整齐。

对我有利就打，对我无利就停止行动。

试问：敌人兵员众多且又阵势严整向我发起进攻，那该用什么办法对付它呢?

回答是：先夺取敌人最关心爱护的，这样就听从我们的摆布了。

用兵之理贵在神速，要乘敌人措手不及的时机，走敌人意料不到的道路，攻击敌人没有戒备的地方。

英文这么说：

Those who were called skillful leaders of old knew how to drive a wedge between the enemy'sfront and rearto prevent co-operation between his large and small divisions;to hinder thegood troops from rescuing the bad,the officers from rallying their men.When the enemy's menwere united, they managed to keep them in disorder.When it was to their advantage, theymade a forward move; when otherwise, they stopped still.If asked how to cope with a greathost of the enemy in orderly array and on the point of marching to the attack,I should say: "Begin by seizing something which your opponent holds dear; then he will be amenable toyourwill."Rapidity is the essence of war: take advantage of the enemy's unreadiness, makeyour way by unexpected routes,and attack unguarded spots.

单句理解

所谓古之善用兵者，能使敌人前后不相及，众寡不相恃，贵贱不相救，上下不相收，卒离而不集，兵合而不齐。合于利而动，不合于利而止。孙子在这里提出了“和余力而动，不合于利而止”的战争指导原则。这种原则主要是使敌人前后不能相救，上下不能相及，从而阻断敌人内部的有机联系，达到降级敌人战斗力的目的。总之，军事行动要以对我方有利为原则。