Apart from archaeological data, the main source on this historical period comes from chapter 115 of Sima Qian's Records of the Grand Historian.
Jun accepted and appointed Wiman commander of the western border region of Gojoseon, which probably corresponds to the west of the present-day Liaoning.
Nan Lü (Hanja: 南閭), who was a monarch of Dongye and a subject of Wiman Joseon, revolted against Ugeo of Gojoseon and then surrendered to the Han dynasty with 280,000 people.
As a result, in 109 BC, the Emperor Wu of Han invaded Wiman Joseon near the Luan River.
After the war, Wudi of Han dynasty sentenced two generals to death for failing to defeat Wiman Joseon.