 On June 20, 1947, the 17th Division of the communist 6th Column unleashed its assault on the nationalist headquarters, and by the evening, the enemy was dangerously close.Chen Mingren (陈明仁), the nationalist commander-in-chief inside the headquarters was forced to evacuate into another alternate headquarters in a different bunker in the eastern half of the city, while his brother, Chen Mingxin (陈明信), the regimental commander of the Specialized Duties Regiment of the nationalist 71st Army, was left to defend the original headquarters.After three hours of fierce fighting, the headquarters fell and its defenders were annihilated.