"Sui Dynasty" . "Sui" . "failed war" . . . "four unsuccessful campaigns" . "first war with Goguryeo (Korea)" . . "Goguryeo\u2013Sui War" . "Unknown" . "Goguryeo War" . "disastrous campaigns" . . "598\u2013614 invasion of Korea" . . "campaigns against Goguryeo" . . "Like the emperors of the Sui dynasty before him" . "second campaign" . . . . . . . . . . . . . . . . . . . "Goguryeo-Sui Wars" . ":Goguryeo\u2013Sui War" . "Korea" . . . . "massive military campaigns" . . "Nominally 1,133,800 combat troops with around 2,000,000 support troops during the second invasion of 612, according to the Book of Sui and Samguk Sagi." . "Goguryeo-Sui War" . . . . "four disastrous wars" . "Goguryeo\u2013Sui Wars" . "Sui dynasty" . . "Goguryeo victory" . "Goguryeo" . "three campaigns" . "four disastrous campaigns to Goguryeo" . . . . . "*One of the major causes of thefall of the Sui Dynasty" . . "costly and disastrous military campaigns" . . . . . . . "Goguryeo\u2013Sui War" . .