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.
Li Ch‘üan remarks that the ground is less likely to be treacherous
where there are trees, while Tu Yu says that they will serve to
protect the rear. Capt. Calthrop, with a perfect genius for going
wrong, says “in the neighbourhood of a marsh.” For 若 the _T‘ung
Tien_ and _Yü Lan_ wrongly read 爲, and the latter also has 倍
instead of 背.
So much for operations in salt-marshes.