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
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
	Location of the battle

The siege of Songping was one of the great victories of Nanzhao during its invasion of the Tang dynasty in 863. Nanzhao took advantage of turmoil in the Tang Protectorate General to Pacify the South (Annan) and allied with local tribes to invade the Tang dynasty, which ruled the Red River Delta in modern-day northern Vietnam. The siege took place at Songping (modern-day Hanoi), capital of the Annan Protectorate, in early 863 during the reign of Emperor Yizong. The siege ended in victory for Nanzhao although their forces were later driven back by a Tang counterattack by 866.