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[Tu Mu says: "As water flows downwards, we must not pitch our

camp on the lower reaches of a river, for fear the enemy should

open the sluices and sweep us away in a flood. Chu-ko Wu-hou has

remarked that 'in river warfare we must not advance against the

stream,' which is as much as to say that our fleet must not be

anchored below that of the enemy, for then they would be able to

take advantage of the current and make short work of us." There

is also the danger, noted by other commentators, that the enemy

may throw poison on the water to be carried down to us.]

So much for river warfare.

7. In crossing salt-marshes, your sole concern should be to get

over them quickly, without any delay.

[Because of the lack of fresh water, the poor quality of the

herbage, and last but not least, because they are low, flat, and

exposed to attack.]

8. If forced to fight in a salt-marsh, you should have water and

grass near you, and get your back to a clump of trees.