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There are several reasons: * The Great Wall isn't an ordinary wall, just use to block the way, but a huge fortress. It has many watchtowers and barracks which can hold a lot of soldiers. * The Great Wall is large enough for soldiers to travel from one watchtower or barrack to another through it, so there no need to get down from it. In case of emergency, it save much time to deploy troops. * On the Great Wall, especially, on its watchtowers, there are lots of excellent points for observation. The larger the range of vision, the faster the reactions can be made. * The Great Wall is also use to communication between the army units in different barracks along it. When there comes the enemy, the observation post detect the situation first will light a signal fire to alert other observation posts. And signal fire will be lighted one by one on the nearest watchtower, until the whole garrison get the message. A soldier below the Great Wall cannot do this quickly. Hence, it is better for soldiers to garrison on the Great Wall than below it.

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16y ago

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