《明史·列传·卷二百一十六》
正统元年冬天，成国公朱勇上奏说 ：近来瓦剌部落的脱飀带兵赶走了鞑靼部落的朵儿只伯，恐怕脱飀吞并朵儿只伯的地盘后会变得日益强大。
正统元年冬，成国公朱勇言： 近瓦剌脱懽以兵迫逐鞑靼朵儿只伯，恐吞并之，日益强大。
In the winter of the first year of the Zhengtong era, Duke Chengguo Zhu Yong submitted a memorial stating: "Recently, Taisun of the Oirats led troops to drive out Dorjiben of the Tatars. It is feared that Taisun will become increasingly powerful after annexing Dorjiben's territory.