With more than 60,000 men and the Vũ lord of Tuyên Quang, Trịnh Kiểm overran the northern provinces and camped at Tiên Du, but could not take Thăng Long; a Mạc raid on Thanh Hóa in 1561 forced him to pull back.
War
Trịnh Kiểm's great northern offensive
- 1559 – 1561
- Southeast Asia