text: On 3 August, Zhu Qiyu was appointed as the provisional administrator of Beijing. He was accompanied by aides who represented the most influential power groups. Prince Consort Commander Jiao Jing (), the son-in-law of the Hongxi Emperor, represented the imperial family. Jin Ying, the head of the Directorate of Ceremonial and the highest-ranking eunuch in the absence of Wang Zhen, led the palace eunuchs. Minister of Personnel, Wang Zhi (), represented the government, and Grand Secretary Gao Gu () was the fourth aide. All major decisions were to be postponed until the emperor's return.
  On 4 August, Emperor Yingzong led his army into battle. Despite a month-long campaign, they achieved no results. However, on their return journey, the imperial army was unexpectedly attacked by the Mongols on 1 September at the Tumu Fortress. The Mongols were able to defeat and scatter the imperial army. Numerous high-ranking commanders were killed, and Emperor Yingzong himself was captured.
  With the approval of Empress Dowager Sun, the mother of Emperor Yingzong, Zhu Qiyu assumed control of the government on 4 September. However, the empress dowager made it clear that his authority was temporary and on 6 September, she named Zhu Jianshen, the two-year-old eldest son of Yingzong, as crown prince.