From The Art of War by Sun Tzu
Thus we may know that there are five essentials for victory:
He will win who knows when to fight and when not to fight.
He will win who knows how to handle both superior and inferior forces.
He will win whose army is animated by the same spirit throughout all its ranks.
He will win who, prepared himself, waits to take the enemy unprepared.
He will win who has military capacity and is not interfered with by the sovereign.
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Now the general who wins a battle makes many calculations in his temple ere the battle is fought. The general who loses a battle makes but few calculations beforehand. Thus do many calculations lead to victory, and few calculations to defeat, how much more no calculation at all!
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Generals who know all possible adaptations to take advantage of the ground know how to use military forces. If generals do not know how to adapt advantageously, even if they know the lay of the land, they cannot take advantage of it.
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Give out rewards that are not in the rules; give out directives that are not in the code.
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When opponents present openings, you should penetrate them immediately. Get to what they want first; subtly anticipate them. Maintain discipline and adapt to the enemy in order to determine the outcome of the war. Thus, at first you are like a maiden, so the enemy opens his door; then you are like a rabbit on the loose, so the enemy cannot keep you out.
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Disciplined and calm, to await the appearance of disorder and hubbub amongst the enemy:–this is the art of retaining self-possession.