After that, the wall has been created several times by another, but later had a strange tribe from Mongolia and Manchuria can invade their great wall of China.
Then there are the walls several times together. But later on, it is the nomadic tribes of Mongolia and Manchuria can be successfully broke through the Great Wall of China.
After the walls for several times. But later she is a tribe of nomadic Mongolian and Manchu from can invade through the great wall of China successfully.