"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.

Quoted from Sun Tzu (pre web ;-)