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fortifications - events| 214 BC–206 BC | China, Qin Empire | Chinese emperor Shi Huang-ti employs general Meng Dian to connect a number of existing defensive walls in northern China to form a single fortified system with watchtowers to keep out the Xiongnu (Huns). Known as the Great Wall of China, it is 2,400 km/1,500 mi long, 9 m/30 ft high, 8 m/25 ft wide at its base, and 5 m/17 ft wide at its top. It is the largest building project ever undertaken. | | 127 | Roman Empire, UK | Hadrian's Wall, marking the northern boundary of Roman colonization in Britain, is virtually completed. It is 117 km/73 mi long and interspersed with forts: if well manned, it will be almost impregnable. | | 1456–1457 | Japan | Ota Dokan founds the city of Yedo (modern Tokyo) in Japan by building a castle near the mouth of the River Sumida, which strategically controls Kanto Plain. |
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