《明史·列传·卷五十二》
国家安危所依靠的，只有于谦、石亨当主率中军，而分别派遣大臣守卫九门，选择忠诚孝敬名声显著的亲王，命他们和守门大臣尽力于王事。
安危所倚，惟于谦、石亨当主中军，而分遣大臣守九门，择亲王忠孝著闻者，令同守臣勤王。
The national security relied on Yu Qian and Shi Heng who led the central army, while other generals were sent to guard the nine city gates. Loyal and honest princes were chosen to support them.