ABSTRACT
Whenever you engage an enemy in combat along or on rivers and lakes, it is necessary to have boats and oars. Moreover, you should assume a position upwind or upstream. One who is upwind can, by exploiting the wind, employ an incendiary attack to set the enemy afire. One who is upstream can utilize the current's strategic power to ram the enemy with high-walled war vessels. In such cases you will always be victorious in battle. The Art of War states: "One who wants to engage in combat does not go contrary to the current's flow."
