4.20 Chapter: Tactical Positions 4.20 Translation: The onrush of a conquering force is like the bursting of pent-up waters into a chasm a thousand fathoms deep. CommentaryDynamics count. A speeding bullet does far more damage than if it was thrown by hand. The momentum of a powerful charge can break through a even a strong defense. In business, momentum can be caused by a string of successes that keeps competitors on the back foot and may even drive them out of the market.