War

Trịnh Kiểm's great northern offensive

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.

Meanwhile, elsewhere

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