Chinese forces under General Liu Gang move to crush rebellions in China’s northern Vietnamese provinces of Tonkin and Annam, then march south in 605, defeat the army of Cham king Sambhuvarman by luring the enemy war-elephants into an area booby-trapped with camouflaged pits; the Sui forces then massacre the defeated troops, seize Ch'u-su, and sack the Cham capital at Tra-kieu.

Following the withdrawal of the Chinese forces, Sambhuvarman resumes control and obtains forgiveness from Emperor Yang of Sui.