In the longest round of the war, the only time the Nguyễn attacked north, Nguyễn Hữu Tiến and Nguyễn Hữu Dật crossed the Gianh and took the seven districts of Nghệ An south of the Lam river; after years of fighting Trịnh Căn won them back in late 1660.
War
Nguyễn offensive into Nghệ An
- 1655 – 1660
- Southeast Asia
Meanwhile, elsewhere
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