Great Wall of Han Dynasty
The Great Wall of Han Dynasty is the longest one among those of all other dynasties. The Han Great Wall starts from the Shanhaiguan Pass in the east to Luobu Po of Xinjiang Ugyur Autonomous Region extending more than 6700 kilometers from east to west. It is usually refered as the 'Ten-Thousand Li Great Wall', as one kilometer equals two Li's. In 127 BC Emperor Han Wudi ordered to construct the Great Wall. This extended the Wall into Inner Mongolia itself, and renovated much of the older wall near this border. Altogether Han Wudi had built a thousand kilometers (621 miles) of defense wall over twenty years to secure the passage to the Western Region.
One of Emperor Han Wudi's generals, Huo Qubing, launched a military campaign against the Hun in 121 BC, pushing them deep into Mongolia, allowing him to secure the Hexi Corridor, the passage to the Western Region. The Wall was promptly extended to secure this area, from Yongdeng County to Jiuquan City in Gangsu. This section of the Wall saw many incursion attempts from the Hun and their allies the Qiang, but it was too strong for them to breach. Around 101 BC Chinese workers built the section from Yumenguan Pass to Luobu Po of Xinjiang Ugyur Autonomous Region. The Huns power later was in decline and consequently less wall-building activity came about this side of the border.
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