There has never been a protracted war from which a country has benefitted.
When your opponent gives you an opening, be swift as a hare.
Begin by seizing something which your opponent holds dear; then he will be amenable to your will.
In the midst of chaos, there is also opportunity.
When the soldiers stand leaning on their spears, they are faint from want of food.
When you know both yourself as well as your competition, you are never in danger. To know yourself and not others, gives you half a chance of winning. Knowing neither yourself or your competition puts you in a position to lose.