On this day, 78 years ago, on January 20, 1947 (December 29, 1946, the troops of the Shanxi-Chahar-Hebei Military Region of the People's Liberation Army of China launched the Battle of Baonan. Outline of the Battle of the Southern Defense of the China People's Liberation Army. In order to break the blockade of the Kuomintang army on the central Hebei and Shanxi regions and ensure the westward transportation of grain in the central Hebei region, the Shanxi-Chahar-Hebei Military Region decided to take advantage of the weak Kuomintang garrison on the Wangdu and Zhengding sections of the Pinghan Railway and order the 4th Column to command its 10th and 11th Brigade and the independent 1st Brigade of the Hebei-Shanxi Military Region and the 3rd and 9th Army Subdivisions to launch the Battle of Baoding (Ding) Nan. On the night of January 20, 1947, the 10th and 11th brigades of the 4th Column of the Shanxi-Chahar-Hebei Military Region suddenly attacked in the wind, snow and severe cold, conquering Wangdu City and Wangjing Village in one fell swoop, and annihilating one regiment and one battalion of the 5th Security Corps; The troops of the 1st Independent Brigade and the 3rd and 9th Army Subdivisions launched a breakthrough battle along the Dingxian to Xinle Railway. On the night of the 21st, the main force of the 4th Column continued to move southward between Dingxian and Xinle. On the 23rd, it captured Xinzhaisidian, Xinxian County, with one force, and opened up a battlefield. The main force set up ambushes on both sides of the railway south of Dingxian County, preparing to fight reinforcements. On the 24th, when the 1st Regiment of the 5th Security Corps of the Kuomintang Army and the 1st Division of the 32nd Division, which had been aided by Xinle North, entered the Shijiache area, they were completely annihilated by the 4th Column's ambush troops. Subsequently, the 1st Independent Brigade advanced southward, and the Kuomintang defenders in Xinle County abandoned the city and fled. On the 28th, the 4th Column and other troops launched a general attack on Ding County, which was isolated and isolated. One of the three regiments of the garrison troops was wiped out, and the rest fled to the Wangdu area and were intercepted and annihilated by the 2nd Column. In the Battle of Baonan, the troops of the Shanxi-Chahar-Hebei Military Region annihilated more than 8000 Kuomintang troops, controlled more than 100 kilometers of the Pinghan Railway south of Baoding, cut off the connection between the Kuomintang troops in Baoding and Shijiazhuang, and connected the Shanxi-Chahar-Hebei Jiefang District, Zhong-Hebei and Hebei and Shanxi.