《北史·列传·卷八十六》
于是太武帝出兵东路，向黑山；平阳王长孙翰从西路，向大娥山；共同会合在贼寇都庭。
于是车驾出东道，向黑山；平阳王长孙翰从西道，向大娥山。同会贼庭。
So the Emperor Taiwu sent troops east, towards Mount Heishan; the Prince of Pingyang, Changsun Han, went west, towards Mount Da'e; they planned to meet up at the rebel headquarters.