Siege of Songping

Siege of Songping (863)
Part of Tang-Nanzhao war in Annan
Date Spring 863 (14 January – 1 March, 1 month 15 days) Location Songping, Protectorate of Annan (present-day Hanoi, Vietnam) 21°01′42″N 105°51′15″E / 21.02833°N 105.85417°E / 21.02833; 105.85417 Result Nanzhao victory Temporary Nanzhao occupation of the Red River Delta Weakening of the Tang dynasty
Belligerents
Nanzhao	Tang dynasty
Commanders and leaders
Duan Qiuqian Yang Sijin Chu Đạo Cổ	Cai Xi †
Strength
50,000	Unknown
Casualties and losses
Unknown	Unknown
class=notpageimage| Location of the battle

Part of a series on the
History of Hanoi
Âu Lạc period Cổ Loa Citadel
Chinese period Jiaozhi Siege of Jiao (271) Long Biên Tống Bình Siege of Songping (Tang-Nanzhao war) Đại La
Imperial period Edict on the Transfer of the Capital Imperial Citadel of Thăng Long Sack of Thăng Long (1285) Sack of Thăng Long (1288) Sack of Thăng Long (1371) Sack of Thăng Long (1383) Battle of Chương Dương Đông Kinh Bắc Thành Battle of Hanoi (1873) Battle of Hanoi (1882) Battle of Gia Cuc Battle of Cầu Giấy (1883)
French period Great Hanoi Rat Massacre Hanoi Exhibition Hanoi Poison Plot
Modern Hanoi Declaration of independence Battle of Hanoi (1946) Operation Rolling Thunder Hà Tây province Sơn Tây prison camp Operation Ivory Coast APEC Vietnam 2006 Millennial Anniversary of Hanoi 2017 Hanoi hostage crisis 2019 North Korea–United States Hanoi Summit
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The siege of Songping or the siege of Hanoi was the pivotal part of Nanzhao's great offensive in 863. Nanzhao was in alliance with local tribal rebels, against the Tang dynasty who was currently in control of the Red River Delta in modern-day northern Vietnam. The siege took place in Songping (modern-day Hanoi), capital of Tang's frontier Protectorate General to Pacify the South in early 863 during the reign of Emperor Yizong. It was the fourth time since 858 that Songping was attacked by Nanzhao forces

The siege was one of the most important and tragic events in the history of Vietnam before the tenth century. With 50,000 men from its main army and other tribal mercenaries combined, the Yunnanese approached Songping and issued an ultimatum to surrender or die. They laid siege on the city from mid-January until its fall on 1 March, resulting in military disaster and the retreat of Tang forces out of the region in 2 years.