Yu Qian saves Beijing after Tumu
In 1449 the Zhengtong emperor was captured by the Oirat leader Esen at Tumu Fortress, and much of the court argued for moving the capital south. Minister of War Yu Qian refused to abandon Beijing, backed enthroning the emperor's brother, and organised the city's defence, which repelled the Mongol siege. When the captured emperor regained the throne in 1457, Yu Qian was executed on a charge of treason, showing that saving the state did not protect a minister from the politics of loyalty to a person.