Xuan-de: Year 1, Month 12, Day 28
25 Jan 1427
The An-yuan Marquis and Regional Commander Liu Sheng, and others memorialized: "Now that we are proceeding on expedition to Jiao-zhi, we will need to use military order flags and warrants (令旗牌面)." The Emperor ordered the Auxiliary Ministry of Works to manufacture and provide these.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 17, page 623