Spies cannot be usefully employed without a certain intuitive sagacity.
For them to perceive the advantage of defeating the enemy, they must also have their rewards.
If words of command are not clear and distinct, if orders are not thoroughly understood, the general is to blame. But if his orders are clear, and the soldiers nevertheless disobey, then it is the fault of their officers.
In war, numbers alone confer no advantage. Do not advance relying on sheer military power.
First learn to become invincible, then wait for your enemy's moment of vulnerability.
What is of the greatest importance in war is extraordinary speed: One cannot afford to neglect opportunity.