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In spring 350, Murong Jun launched the attack, and they quickly captured the important city of Jicheng (薊城, in modern Beijing).
Guonei City, within the modern city of Ji’an, played the role of a supporting capital after the main Koguryo capital moved to Pyongyang.
The small city of Ji’an is within the Jinggangshan region, the “cradle of the Chinese revolution” and birthplace of the Chinese Red Army (the People's Liberation Army of China).