《明史·列传·卷十七》
太祖对傅友德说： 蜀人听说我军西伐，必定将其全部精锐部分东守瞿塘，北阻金牛，抵抗我军。
太祖谕友德曰： 蜀人闻我西伐，必悉精锐东守瞿塘，北阻金牛，以抗我师。
Emperor Taizu said to Fu Youde: "When the Shu people hear that our army is attacking westward, they will definitely deploy their entire elite force to defend Qutang in the east and block金牛 in the north to resist our army.