“As for deploying the army and fathoming the enemy:
“To cross mountains follow the valleys, search out tenable ground,135
and occupy the heights. If the enemy holds the heights, do not climb up to engage them in battle. This is the way to deploy an army in the mountains.136
“After crossing rivers137
you must distance yourself from them. If the enemy is fording a river to advance, do not confront them in the water. When half their forces have crossed, it will be advantageous to strike them. If you want to engage the enemy in battle, do not array your forces near the river to confront the invader but look for ...