Han conquest of Old Chosŏn

The Han conquest of Old Chosŏn was a campaign launched by Emperor Wu of the Han dynasty against Wiman Chosŏn between 109 and 108 BCE. It resulted in the fall of Old Chosŏn and the establishment of the Four Commanderies of Han in the northern half of the Korean Peninsula. == Background == Wi Man, or Wei Man (Chinese), was originally a general in the vassal kingdom of Yan under the rule of Lu Wan.