鄭梉
After a break of nine years, Trịnh Tráng launched a new major assault in 1642. This time they had their own European cannons, purchased from the Dutch. They also had modern Dutch ships to lead their fleet. At first the assault went well and the first of the great walls was breached. The attack was renewed in 1643 but the second wall could not be taken. At sea, once again the Nguyễn fleet defeated the Royal (Trịnh) fleet. The offensive halted and the Trịnh withdrew.