Tumu Crisis
The Crisis of the Tumu Fortress (), also known as the Tumu Crisis (; ), or the Jisi Incident (), was a frontier conflict between the Mongol Northern Yuan and the Chinese Ming dynasty. The Mongol Oirat ruler, Esen Taishi, captured the Chinese Emperor Yingzong on September 1, 1449. Beginning of the conflict. In July 1449, Esen Taishi launched a large-scale, three-pronged invasion of the Ming with his puppet khagan Toqtaq-Buqa. He personally advanced on Datong (in northern Shanxi province) in August. The eunuch official Wang Zhen, who dominated the Ming court, encouraged the 22-year-old Emperor Yingzong  of Ming to lead his own armies into battle against Esen. The size of Esen's army is unknown but a best guess puts it at some 20,000 men. The Ming army of about 500,000 was hastily assembled; its command was made up of 20 experienced generals and a large entourage of high-ranking civil officials, with Wang Zhen acting as field marshal. On August 3, Esen's army crushed a badly supplied Ming army at Yanghe, just inside the Great Wall. The same day the Emperor appointed his half-brother Zhu Qiyu as regent. The next day he left  Beijing for Juyong Pass. The objective was a short, sharp march west to Datong via the Xuanfu garrison, a campaign into the steppe and then a return to Beijing by a southerly route through Yuzhou. Initially the march was mired by heavy rain. At Juyong Pass the civil officials and generals wanted to halt and send the emperor back to Beijing, but their opinions were overruled by Wang Zhen. On August 16, the army came upon the corpse-strewn battlefield of Yanghe. When it reached Datong on August 18, reports from garrison commanders persuaded Wang Zhen that a campaign into  the steppe would be too dangerous. The "expedition" was declared to have reached a victorious conclusion and on August 20 the army set out back toward the Ming. Wang Zhen. Fearing that the restless soldiers would cause damage to his estates in Yuzhou, Wang Zhen decided to strike northeast and return by the same exposed route as they had come. The army reached Xuanfu on August 27. On August 30, the Northern Yuan forces attacked the rearguard east of Xuanfu and wiped it out. Soon afterwards they also annihilated a powerful new rearguard of cavalry, led by the elderly General  Zhu Yong, at Yaoerling. On August 31, the imperial army camped at the post station of Tumu. Wang Zhen refused his ministers' suggestion to have the emperor take refuge in the walled city of Huailai, just 45 km ahead. Esen sent an advance force to cut access to water from a river south of the Ming camp. By the morning of September 1 they had surrounded the Ming army. Wang Zhen rejected any offers to negotiate and ordered the confused army to move toward the river. A battle ensued between the disorganized Ming army and the advance guard of Esen 's army (Esen was not at the battle). The Ming army basically dissolved and was almost annihilated. The Northern Yuan forces captured a huge quantity of arms and armour while killing most of the Ming troops. All the high-ranking Ming generals and court officials were killed. According to some accounts, Wang Zhen was killed by his own officers. The Emperor was captured, and on September 3 he was sent to Esen's main camp near Xuanfu. Aftermath. The entire expedition had been unnecessary, ill-conceived, and poorly commanded. The Northern Yuan victory was won by an advance guard of  perhaps as few as 5,000 cavalry. Esen, for his part, was not prepared for the scale of his victory or for the capture of the Ming emperor. At first he attempted to use the captured emperor to raise a ransom and negotiate a favourable treaty including trade benefits. However, his plan was foiled in the Defense of Beijing due to the steadfast leadership of the Ming commander in the capital, General Yu Qian. The Ming leaders rejected Esen's offer, Yu stating that the country was more important than an emperor's life. The Ming never paid a ransom for  the return of the Emperor, and Esen released him four years later. Esen himself faced growing criticism for his failure to exploit his victory over the Ming and he was assassinated six years after the battle in 1455. Statistics. The defeated Ming forces were numbered around 500,000 whereas the Oirat forces numbered 20,000.