In warfare, there are no constant conditions. He who can modify his tactics in relation to his opponent will succeed and win.
Keep your friends close and your enemies even closer.
Birds rising in flight is a sign that the enemy is lying in ambush; when the wild animals are startled and flee he is trying to take you unaware.
In war, then, let your great object be victory, not lengthy campaigns.
A wise general makes a point of foraging of the enemy.
Plan for what is difficult while it is easy, do what is great while it is small.