"It is the business of a general to be quiet and thus ensure secrecy; upright and just, and thus maintain order.
He must be able to mystify his officers and men by false reports and appearances, and thus keep them in total ignorance.
By altering his arrangements and changing his plans, he keeps the enemy without definite knowledge. By shifting his camp and taking circuitous routes, he prevents the enemy from anticipating his purpose.
At the critical moment, the leader of an army acts like one who has climbed up a height and then kicks away the ladder behind him. He carries his men deep into hostile territory before he shows his hand.
He burns his boats and breaks his cooking-pots; like a shepherd driving a flock of sheep, he drives his men this way and that, and nothing knows whither he is going.
To muster his host and bring it into danger:–this may be termed the business of the general.''
Sun Tzu