Cause & Context
Sui and Goguryeo faced prolonged tension over the Liaodong frontier, tributary relations, and the regional order of Northeast Asia. A major war began in 598, followed by successive Sui expeditions from 612 to 614.
Epochal Overview
The wars included coordinated land and naval operations, sieges in Liaodong, advances toward Pyongyang, and the Battle of the Salsu. Long supply lines, command problems, and Goguryeo defenses imposed heavy losses, and the Sui expeditions failed to compel submission.
Civilizational Impact
The wars did not end Goguryeo's independence, but they severely strained Sui finance, transport, and conscription and, together with corvée burdens and rebellions, accelerated the late-Sui crisis.
Key Figures
Emperor Yang directed the Sui mobilization, with commanders including Yuwen Shu and Lai Hu'er; King Yeongyang organized Goguryeo's defense, and Eulji Mundeok became renowned for the Salsu campaign. Civilians and soldiers on both sides bore the costs.