Tadun and his allies, as Cao Cao's army reaches the valley of Daling River by autumn in the eighth lunar month, realize what is happening, hastily withdraw from their prepared positions, and gather to face Cao Cao to the north.
With tens of thousands of men gathered, Tadun, along with Yuan Shang, Yuan Xi, and the two Wuhuan chanyu Louban and Wuyan, meet Cao Cao's army at White Wolf Mountain (near present-day Lingyuan, Liaoning).
The encounter is sudden for both parties.
Faced with superior numbers and the baggage left in the rear, Cao Cao's lightly armored men become afraid.
The Wuhuan, on the other hand, are evidently unprepared for battle as they are not in proper formations, nor do they attempt to take the initiative by harassing Cao Cao's march.
Undaunted, Cao Cao climbs a slope to observe the enemy's formations.
He sees that the Wuhuan are in disorder, and immediately unleashes his soldiers to exploit this weakness.
With general Zhang Liao leading the offensive, the light force swiftly defeats the Wuhuan cavalry, and Cao Chun's brigade captures Tadun.
Within a short time, Tadun and many of his men are killed and the battle is over.
Over two hundred thousand Chinese settlers and Wuhuan tribesmen surrender to Cao Cao.
In a single engagement, Cao Cao has broken the back of Wuhuan resistance.
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