Champa's surprise attack on Thăng Long in Đại Việt

Name: Champa's surprise attack on Thăng Long in Đại Việt
Start: 1177

Type Event Region Southeast Asia Time 1177

In 1177, Champa's king led a fleet upriver to sack Thăng Long, the Đại Việt capital, triggering a succession crisis and a long war of vengeance.

Timeline

1177Waterway from the Red River mouth to Thăng Long · VietnamExploiting Đại Việt's lax defenses, Champa forces moved swiftly north from the South China Sea via the Red River waterway, bypassing land fortresses. Jayavarman IV personally led the fleet, launching a surprise attack while Lý Cao Tông was holding celebrations in Thăng Long and the imperial guard was dispersed.
1177Imperial city of Thăng Long · VietnamChampa troops stormed Thăng Long, burning palaces and government offices; Lý Cao Tông fled amid the chaos. The fall of the capital caused the collapse of the Đại Việt central government, with royal clans and powerful ministers each enthroning a young ruler, laying the groundwork for subsequent regency struggles and the war of vengeance against Champa.

Cham–Vietnamese War (1177) https://en.wikipedia.org/wiki/Cham%E2%80%93Vietnamese_War_(1177)
Jaya Indravarman IV https://en.wikipedia.org/wiki/Jaya_Indravarman_IV