Gongsun Kang
When Cao Cao's forces arrived at Yi (), Guo Jia said, "A swift army is powerful. Now, as we've travelled a long distance, we have much heavy baggage so we cannot launch a swift attack. If the enemy learns of our approach, they will definitely prepare defences. Why don't we leave the heavy baggage behind and send our light forces to take a shortcut and launch a surprise attack?" Cao Cao led his army through a secret passage at Lulong Pass () and headed directly towards the Wuhuan chieftains' headquarters. The Wuhuan were shocked when they heard of Cao Cao's approach and they hastily assembled their army, but were defeated by Cao Cao at the Battle of White Wolf Mountain. Tadun was killed in battle. The Yuan brothers fled to Liaodong to join the warlord Gongsun Kang, who captured and executed them and then sent their heads to Cao Cao.