Experience
in choosing the terrain
Stress
is made on the choice of terrain in constructing mountain pass, beacon
fire site, smoke-making platform and castle in order to gain strategy
and save manpower and materials.
This is called a way to utilize terrain and build massive fortification,
mountain pass and beacon tower in strategic places. It
is entirely in keeping with the principles of military science.
The massive
fortification between Liaodong (eastern Liaoning province), Shanhaiguan
Pass and Juyongguan Pass were constructed along mountain ridges. Rocks
and steep cliffs were therefore utilized. One look from the outside
at many parts of the fortification seems to suggest that the Great Wall
was located in very dangerous place indeed. Yet inside we find the walls
were in level and low place. Defending the barrier the soldiers can
easily repulse invaders and ascend or descend the wall without difficulty.
It is easy to transport military supplies too. Some cliffs are used as
walls, known as cliff wall and some steep places are used as walls,
too. The enemy can hardly be expected to climb such precipitous ramparts.
When the Great Wall reaches a big river or lake the natural barrier
is again used for strategic purpose. |