Yang Su
In 599, after Ashina Rangan reported that Ashina Yongyulü was planning to attack, Emperor Wen took preemptive action and had Gao Jiong, Yang Su, and Yan Rong () command a three-pronged attack against Ashina Yongyulü, with Yang Liang in nominal command but not at the frontline. In response, Ashina Yongyulü and Ashina Dianjue made a joint attack against Ashina Rangan, defeating him and largely seizing his tribe. Ashina Rangan fled to Sui, and Emperor Wen treated him as an honored guest. Subsequently, both Gao Jiong and Yang Su engaged Göktürk forces and repelled them.