The Chinese armies reconquered annam, as northern Vietnam was then known, in Southeast Asia and kept back the mongols, while the Chinese fleet sailed the China seas and the Indian ocean, cruising as far as the east coast of africa. 明朝军队再次征服安南(即位于东南亚的越南的北部地区),并抵抗了蒙古人的入侵,同时明朝的舰队可以自由航行于中国海域和印度洋,远至非洲的东海岸。