Yang Liang
In winter 599, Emperor Wen sent Yang Su again to attack Ashina Yongyulü, but before his army could depart, Ashina Yongyulü was assassinated and replaced by Ashina Dianjue (as Bujia Khan), and so Yang Su did not launch his army. In 600, when Ashina Dianjue attacked, Emperor Wen sent Yang Su and Shi Wansui (史萬歲), along with his sons Yang Guang and Yang Liang, to resist, and Ashina Dianjue was fought off. (The historians had much to say as to Shi's success during this campaign, but not Yang Su's, suggesting that Yang Su was not involved in major engagements during this campaign.)