The only invaders from (Red) China were in the Korean War (1950-1953) when they crossed into North Korea across the Yalu River.
to keep out the Mongol invaders
China and the U.S.
Shi Huangdi built the first incarnation of the Great Wall of China to protect China from invaders to the North.
China built the Great Wall to protect their country from invaders.
The first compass was invented in China by a man who noticed a certain point always faced one direction. (I think)
from chemoslavia
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To keep Invaders out of China
To protect china from invaders!
it was used to keep out invaders
The Monguls
to keep out the Mongol invaders
To protect china from invaders
in both cases the china is fine, white and almost translucent, as fine bone china always is.
The Gobi desert provided china with protection from northern invaders
it protected them from invaders and wars!
the great wall