Emperor Taiwu, with only Cui Hao in…
429 CE
Emperor Taiwu, with only Cui Hao in support and most other officials opposing, launches a major attack on the Rouran in 429. (The officials who oppose this largely worry that Emperor Wen of Liu Song, who had for years wanted to regain the provinces south of the Yellow River that Emperor Mingyuan captured in 422 and 423, would attack.)
Emperor Taiwu points out that even if Liu Song could attack, it becomes even more crucial to defeat the Rouran first, lest that the Rouran attack at the same time that Liu Song does.
He surprises Yujiulü Datan, whose people scatter, forcing him to flee.
However, as he chases Yujiulü Datan, he himself becomes hesitant to advance further, and he withdraws.
Only later does he hear that he was in fact very close to Yujiulü Datan's position and could have captured the Rouran khan had he chased further, and he regrets his withdrawal.
On the way back, he also attacks Gaoche tribes, and along with the Rouran tribes that he captures, resettles them south of the Gobi Desert and has them practice agriculture.
From this point on, Northern Wei's northern provinces will become rich and no longer lack livestock and leather.
He greatly rewards Cui, and from this point accepts Cui's advice at all times.