5 events the sources record for this year, grouped by region.
What happened
China (1)
An edict: construction of the Beijing palace would begin the following May, and timber was to be gathered in Sichuan and Huguang. (History of Ming (Mingshi), Annals 明史 卷6 永樂四年)
Southeast Asia (4)
The Ming gave Han Guan and Huang Zhong 100,000 Guangxi troops and sent them to invade. (Đại Việt sử ký toàn thư 本紀卷之八 「丙戌<sub>漢蒼開大四年，明永」)
The Ming's Zhang Fu and Chen Xu invaded the Pha Lũy pass and others with 400,000 troops. (Đại Việt sử ký toàn thư 本紀卷之八 「丙戌<sub>漢蒼開大四年，明永」)
Zhu Neng was made Expedition General against Annam, with Mu Sheng and Zhang Fu as deputies; an edict ordered the execution of Lê Quý Ly and his son and the installation of a descendant of the Chen clan. (History of Ming (Mingshi), Annals 明史 卷6 永樂四年)
Zhang Fu crushed the Annamese army at the Gialam River and took Đông Đô and Tây Đô one after another. (History of Ming (Mingshi), Annals 明史 卷6 永樂四年)