Trịnh–Nguyễn War
Southeast Asian powers started fielding arquebuses by 1540. Đại Việt was considered by the Ming to have produced particularly advanced matchlocks during the 16–17th century, surpassing even Ottoman, Japanese, and European firearms. European observers of the Lê–Mạc War and later Trịnh–Nguyễn War also noted the proficiency of matchlock making by the Vietnamese. The Vietnamese matchlock was said to have been able to pierce several layers of iron armour, kill two to five men in one shot, yet also fire quietly for a weapon of its caliber.