In his classic work Art of War, legendary general Sun Tzu taught: "If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat." We do not mean to suggest that litigation is a "battle" or that opposing parties are "enemies," but in our adversarial system, the underlying lesson is the same: Proactively identifying and preparing to defend against the strengths in your opponent's case is essential.