 Tianshun proved to be a troubled time and Mongol forces within the Ming military structure continued to be problematic . On 7 August 1461 , the Chinese general Cao Qin and his Ming troops of Mongol descent staged a coup against the Tianshun Emperor out of fear of being next on his purge @-@ list of those who aided him in the Wresting the Gate Incident . Cao 's rebel force managed to set fire to the western and eastern gates of the Imperial City ( doused by rain during the battle ) and killed several leading ministers before his forces were finally cornered and he was forced to commit suicide . 
