The Battle of Liyang, fought between October 202 and June 203 in the late Eastern Han dynasty, was an invasion attempt by the warlord Cao Cao against the brothers Yuan Shang and Yuan Tan, the sons of Cao's rival Yuan Shao. The battle in October 202 was the first between the two factions since the death of Yuan Shao four months earlier. Although it ended in Cao Cao's withdrawal, events in this battle brought tensions between the Yuan brothers to the surface as Yuan Tan mutinied against his younger brother Yuan Shang after Cao Cao's temporary exit from the scene.
