Did any attacker in history cross the wall of China?

  During the early 13th century, China was divided and weakened by rival dynasties: the Jin, the Western Xia, and the Southern Song.  In this chaotic and fragmented political landscape, the Mongols saw an excellent opportunity to expand their empire.  They took advantage of internal divisions within China and launched a series of campaigns to conquer and integrate these rival states into their territory.  Through their military prowess and strategic planning, the Mongols established a vast and powerful empire that spanned much of Asia and Europe.  Despite facing stiff resistance from various Chinese dynasties, the Mongols overcame their opponents and conquered China by 1279, ushering in the Yuan dynasty, a period of Mongol rule that lasted nearly a century. 

  The Mongol army was a formidable force that posed a significant threat to Chinese dynasties.  They gained a modern advantage by bypassing the Great Wall of China, a series of fortifications protecting the country against foreign invasion.  Instead of trying to breach the wall, the Mongols found ways to bypass it by passing through unknown mountain passes along the Chinese northern border.  From there, they launched regular military incursions into northern China, targeting cities and towns and wreaking havoc.  These raids had a devastating effect on the Jin dynasty, which ruled northern China at the time.  The Jin dynasty retreated to central China to regroup and rebuild.  However, despite their efforts to defend themselves, the Jin soldiers were no match for the Mongols, who soundly defeated them at the Battle of Yehuling in 1211.