"In the spring, at the time when kings go off to war, David sent Joab out with the king’s men and the whole Israelite army... But David remained in Jerusalem." - 2 Samuel 11:1   A lone guard stood watch atop the ancient city walls of Sardis, looking out across the sheer rock cliffs that protected his home. For centuries, military leaders considered this fortress completely unscalable. The natural barrier was so formidable that those resting inside felt entirely invincible, believing no...