북연
However, later that year, Feng Hong refused to send Feng Wangren to Pingcheng to visit Emperor Taiwu. When his official Liu Zi (劉滋) warned him that Northern Yan was in an even more perilous position than Shu Han and Eastern Wu were facing against Jin, Feng Hong executed Liu in anger. Because Feng Hong refused to send Feng Wangren, Emperor Taiwu again sent Tuoba Jian against Northern Yan, and Tuoba Jian seized Northern Yan's crops and some of its people before withdrawing.