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Page 82
Occupy Strong Natural Positions
Sun Tzu says:
Generally, when an army takes up a position and sizes up the enemy situation, it should pay attention to the following:
When crossing the mountains, be sure to stay in the neighborhood of valleys; when encamping, select high ground facing the sunny side; when high ground is occupied by the enemy, do not ascend to attack. So much for taking up a position in mountains.
After crossing a river, you should get far away from it. When an advancing invader crosses a river, do not meet him in midstream. It is advantageous to allow half his force to get across and then strike. If you wish to fight a battle, you should not go to meet the invader near a river which he has to cross. When encamping in the riverine area, take a position on high ground facing the sun. Do not take a position at the lower reaches of the enemy. This relates to positions near a river.
In crossing salt marshes, your sole concern should be to get over them quickly, without any delay. If you encounter the enemy in a salt marsh, you should take position close to grass and water with trees to your rear. This has to do with taking up a position in salt marshes.
On level ground, take up an accessible position and deploy your main flanks on high grounds with front lower than the back. This is how to take up a position on level ground. These are principles for encamping in the four situations named. By employing them, the Yellow Emperor conquered his four neighboring sovereigns.

The Advantage of Natural Positioning
In the Science of War, Colonel Henderson wrote:
"...by no means sufficient importance is attached to the selection of positions...and to the immense advantages that are to be derived from the proper utilization of natural features."

 
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