1943年秋到1944年春,日军在太平洋战场连连失利,为了挽救其失败的命运,开辟由朝鲜、我国东北、华北、华中、华南到安南、泰国的陆上交通线,避免美国潜水艇及飞机对其海上运输线的威胁,准备对我国发动新的大规模的军事进攻。1944年3月10日,日本军方制订了《一号作战计划》。其中规定作战目的 In the autumn of 1943 to the spring of 1944, the Japanese army lost its battlefield in the Pacific Ocean successively. In order to save its failed fate, it opened up land transport lines from North Korea, northeast China, northern China, central China and southern China to Annan and Thailand and avoided submarines and aircraft from the United States Threatening the maritime transport line and preparing to launch a new large-scale military attack on our country. On March 10, 1944, the Japanese military formulated Operation Plan One. Which provides for combat purposes