King Wu of Zhou consults Jiang Taigong on military strategy for mountainous terrain. Taigong advocates the "Bird Cloud Formation," a defensive strategy emphasizing preparedness on all sides of a mountain, utilizing both conventional and unconventional tactics. Specific tactics include securing vulnerable points, blocking paths, and employing deception. The goal is to create a strong defensive position, even when outnumbered, to allow for a decisive victory. King Wu approves of this comprehensive plan.