The Tumu Crisis; also called the Crisis of Tumubao or Battle of Tumu Fortress , was a frontier conflict between the Oirat

Oirats

Oirats are the westernmost group of the Mongols who unified several tribes origin whose ancestral home is in the Altai region of western Mongolia. Although the Oirats originated in the eastern parts of Central Asia, the most prominent group today is located in the Republic of Kalmykia, a federal...

 Mongols

Mongols

Mongols ) are a Central-East Asian ethnic group that lives mainly in the countries of Mongolia, China, and Russia. In China, ethnic Mongols can be found mainly in the central north region of China such as Inner Mongolia...

 and the Chinese

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

 Ming Dynasty

Ming Dynasty

The Ming Dynasty, also Empire of the Great Ming, was the ruling dynasty of China from 1368 to 1644, following the collapse of the Mongol-led Yuan Dynasty. The Ming, "one of the greatest eras of orderly government and social stability in human history", was the last dynasty in China ruled by ethnic...

 which led to the capture of the Zhengtong Emperor

Zhengtong Emperor

Zhu Qizhen was an emperor of the Ming Dynasty. He ruled as the Zhengtong Emperor from 1435 to 1449, and as the Tianshun Emperor from 1457 to 1464....

 on September 1, 1449 and the loss of an army of 500,000 men to a much smaller force. This outcome was largely due to the Chinese army's remarkably bad deployment. The Ming expedition is regarded as the greatest military debacle of the dynasty.

In July 1449 Esen Tayisi

Esen Tayisi

Esen taishi was a powerful Oirat Khagan of the Northern Yuan Dynasty in Mongolia in the 15th century. He is best known for capturing the Zhengtong Emperor of the Ming Dynasty in 1450 after the Battle of Tumu Fortress and briefly reuniting the Mongols...

 (Chinese: 也先台吉) of the Oirat

Oirats

Oirats are the westernmost group of the Mongols who unified several tribes origin whose ancestral home is in the Altai region of western Mongolia. Although the Oirats originated in the eastern parts of Central Asia, the most prominent group today is located in the Republic of Kalmykia, a federal...

 Mongols

Mongols

Mongols ) are a Central-East Asian ethnic group that lives mainly in the countries of Mongolia, China, and Russia. In China, ethnic Mongols can be found mainly in the central north region of China such as Inner Mongolia...

 launched a large-scale three-pronged invasion of China with his puppet khagan

Khagan

Khagan or qagan , alternatively spelled kagan, khaghan, qaghan, or chagan, is a title of imperial rank in the Mongolian and Turkic languages equal to the status of emperor and someone who rules a khaganate...

 Toqtaq-Buqa.