Yong-le: Year 18, Month 5, Day 4
14 Jun 1420
The Auxiliary Minister of War was ordered to promote by one grade all those government troops (官旗) who had returned after being sent to Hormuz and other countries in the Western Ocean from two to four times. Thus, Zhu Zhen, commander of the Long-jiang Left Guard, was promoted to assistant commissioner of the Da-ning Military Commission with control over the affairs of the Long-jiang Left Guard. Tang Jing, the guard commander of the Naval Right Guard, was also promoted to assistant commissioner. The others were promoted in accordance with the precedents.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 14, page 2211