There has been some scholarly debate of late as to whether that wall was built to keep foreigners out or to keep the Chinese in. Supposedly if you look at the wall one side is obviously designed to repel forces.
Walls are what halted the hun conquests the world over, they were top tier horse archers, the best by all accounts, though not particularly good at anything else save intimidation and wholesale slaughter. The great wall may have had a secondary function of controlling the movement out of china but unless we are just dramatically misinformed about the history of the huns and the time frames of their activity it has to be for them.
The only wall that haulted hunnic expansion in the west was a wall of germanic and roman shields and spear points.
The only physical barrier involved where pits the westerners dug so the huns couldn't use their horses.
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