Trịnh–Nguyễn War

Trịnh-Nguyễn civil War
	Part of Civil Wars in Vietnam
	; Map of Vietnam circa 1650; Nguyễn Lê dynasty under Trịnh's control Mạc as rump state Kingdom of Champa.
Date	1627–1672 (intermittent); 15 November 1774–1775
Location	Vietnam
Result	1627–1672: Indecisive ; 15 November 1774–1775: Trịnh - Tây Sơn's victory
Territorial; changes	Trịnh captured Phú Xuân in 1775 ; Nguyễn retreated to Quảng Nam, and later to Gia Định; Tây Sơn rebellion emerge ; Beginning of the Tây Sơn wars.
Belligerents
Commanders and leaders

The Trịnh–Nguyễn Civil War (Vietnamese: Trịnh-Nguyễn phân tranh; chữ Hán: 鄭阮紛爭, lit. Trịnh–Nguyễn contention) was a 17th and 18th-century lengthy civil war waged between the two ruling families in Vietnam, the Trịnh lords of Đàng Ngoài and the Nguyễn lords of Đàng Trong, centered in today's Central Vietnam. The wars resulted in a long stalemate and century of peace before conflicts resumed in 1774 resulting in the emergence of the Tây Sơn forces following Trịnh Lords at the time, Nguyễn Lords collapsed in Saigon in 1777. During the division of Vietnam, Gianh River was used as the de facto border between both sides in peacetime.