History › Classical age › Qin Shi Huang, first emperor of China
Great Wall of China
early walls from the 600s BC; joined under Qin; most surviving wall built by the Ming· Book, artwork, monument or document· Asia
Well documentedSolid records, physical evidence or scientific consensus.
A series of walls, forts and watchtowers built over two thousand years to guard China's northern frontier against steppe peoples.
See it on the History map →What happened
Northern Chinese states built rammed-earth walls from about the 600s BC. After unifying China, Qin Shi Huang linked and extended them, using perhaps hundreds of thousands of conscripted laborers, many of whom died. The Han pushed walls west into the Gobi desert. Most of the brick-and-stone wall tourists see was built by the Ming dynasty (1368–1644). A 2012 Chinese survey measured all branches together at about 21,000 km (13,000 miles).
Why it matters
It shows how settled farming states defended against mounted nomads, and it became China's national symbol. It worked best as a system of garrisons, signals and customs posts.
Think of it like
Less a single fence than a perimeter security system: towers, guards and checkpoints controlling who crosses, like gated access rather than a solid wall.
How we know
Surviving ruins, archaeological and satellite surveys, wooden documents from Han frontier garrisons, and Ming construction records.
Still debated
How well it actually kept raiders out is debated; the Mongols and the Manchus both got past it. (It is not visible to the naked eye from space.)
Connections (3)
▸Qin Shi Huang, first emperor of China joined up early sections of Great Wall of ChinaMostly agreed
The connection
After unifying China, Qin Shi Huang sent General Meng Tian with a large army, reportedly 300,000 men, against the Xiongnu nomads. Meng Tian linked the earlier northern walls of the Qin, Zhao and Yan states into one frontier line and extended it, mostly in rammed earth. Legends of workers buried inside the wall grew from its human cost.
When and how
Northern China, c. 215–210 BC; General Meng Tian and conscripted laborers and convicts.
How sure are we?
Sima Qian's Records describe the wall-building; surviving rammed-earth segments in Inner Mongolia and elsewhere are dated to the Qin era.
Debates and open questions
How much wall Qin actually built, rather than repaired and connected, is uncertain; little clearly Qin-built wall survives.
▸Great Wall of China was rebuilt in stone by Ming dynastyWell documented
The connection
Earlier walls were mostly rammed earth. After Mongols captured a Ming emperor in 1449, the Ming spent heavily on frontier defense, and from the late 1400s rebuilt key sections in brick and stone with watchtowers. Most of the wall visitors see today, such as Badaling and Mutianyu near Beijing, is Ming work.
When and how
Northern China, especially the 1470s–1600s; generals like Qi Jiguang oversaw building near Beijing in the 1560s–80s.
How we know
Dated, inscribed bricks and stone tablets on the wall; Ming military records; a 2009 Chinese survey measuring the Ming walls at about 8,850 km (5,500 miles).
Debates and open questions
Whether the wall was worth its huge cost is debated: raiders still broke through, and in 1644 the Manchus entered when a Ming general opened a gate.
▸Great Wall of China failed to keep out Mongol Empire (Genghis Khan)Mostly agreed
The connection
When Genghis Khan attacked the Jin dynasty of northern China in 1211, its frontier walls and ditches did not stop him. Some border peoples paid to guard them, such as the Ongud, had already sided with the Mongols, and Mongol armies forced or bypassed the passes. The wall standing then was not today's Ming wall.
When and how
Northern China, 1211–1215, when Genghis Khan's armies broke through and took the Jin capital Zhongdu, today's Beijing.
How sure are we?
Chinese and Persian histories of the campaign; archaeology of the Jin-era border walls, a separate line from the later Ming wall.
Debates and open questions
Historians debate what walls were really for: stopping armies, slowing raids, or controlling trade and people at the border.