This document discusses the development and spread of gunpowder technology in 15th century Vietnam. It focuses on archaeological evidence, including firearms excavated in Vietnam. The evidence shows that two kings, Le Loi and Le Thanh Tong, emphasized developing the military, including manufacturing Chinese-style firearms. Archaeological finds support that Vietnam learned gunpowder technology from China and was producing its own firearms. The kings reorganized the military, standardized training, and distributed manuals on battle formations and commands based on Chinese models. This helped strengthen Vietnam’s armed forces and military strategies.