广州、武汉失守后,中国的国际补给线粤汉路被日军切断,滇越铁路成为中国外援的主要通道。为了封锁这条运输线,1939年10月16日,日军大本营向在华日军最高指挥机关“中国派遣军”总部下达作战命令。11月13日,日军突袭钦州湾,随后,攻陷防城、钦县,从东南、南、西南三面形成了对南宁的包围圈。11月24日,日军攻陷南宁。12月4日,又进占桂南要地昆仑关。至此,日军的攻势暂告一段 After Guangzhou and Wuhan fell, Yuehan Road, China’s international supply line, was cut off by the Japanese troops and the Vietnam-Vietnam Railway became the main channel for China’s foreign aid. In order to block the transport line, October 16, 1939, the Japanese army headquarters to the highest command of Chinese troops in China, “China’s military” headquarters issued combat orders. On November 13, the Japanese troops raided Qinzhou Bay. Subsequently, they defeated Fangcheng and Qinxian and formed a encirclement of Nanning on three sides from the southeast, south and southwest. November 24, the Japanese army captured Nanning. On December 4, they also took Kunlun Pass, which was the place of southern Guangxi. At this point, the Japanese offensive tentative temporarily