Zheng-tong: Year 6, Month 6, Day 6
24 Jun 1441
The Shan-dong Assistant Regional Commissioner Zhang An was demoted to guard vice commander. Previously An had led troops to the capital for training. It was ordered that he proceed on expedition to Lu-chuan. An was frightened and by declaring himself ill, avoided going...As An had cheated and been guileful, the Emperor demoted him to guard vice commander and it was ordered that he proceed to Da-tong to train troops.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 25, page 1584