Governing from the new city of Phú Xuân (modern Huế), the Nguyễn lord, under Nguyễn Hoàng, slowly expanded their control to the south while the Trịnh lords waged their war for control over the north of Vietnam.
Styrende fra den nye by Phú Xuân (moderne Huế) udvidede Nguyễn-fyrsten under Nguyễn Hoàng langsomt deres kontrol mod syd, mens trịnh-herrerne førte deres krig til kontrol over det nordlige Vietnam.