Sun Tzu says..
Thus we may know that there are five essentials for victory:
1 He will win who knows when to fight and when not to fight.
2 He will win who knows how to handle both superior and inferior forces.
3 He will win whose army is animated by the same spirit throughout all its ranks.
4 He will win who, prepared himself, waits to take the enemy unprepared.
5 He will win who has military capacity and is not interfered with by the sovereign.