1943年底,意大利法西斯宣布无条件投降,希特勒德国已有摇摇欲坠之势,日寇在太平洋上步步失利,世界反法西斯战争的胜败已定格局。1944年春,中共领导的抗日武装力量开始了局部战略反攻,年初,英军占领了马绍尔群岛,日军在太平洋上的交通线有被切断的危险,而且日本本土防卫也受到了中美空军混合团的威胁,因此,日寇准备在中国大陆上作最后挣扎。急需打通由中国东北直到越南的“大陆交通线”,摧毁中美空军在华中、华南的基地、挽救其侵入南洋的孤军,并保住必要时由大陆经朝鲜撤兵的最后通道,为此,日本 At the end of 1943, Italian fascists declared unconditional surrender, Hitler Germany had a faltering tendency, the Japanese invaded the Pacific step by step, and the victory or defeat of the world’s anti-fascist war has been decided. In the spring of 1944, the anti-Japanese armed forces led by the CPC started a partial strategic counterattack. At the beginning of the year, the British occupied the Marshall Islands and the Japanese troops were at risk of cutting off the traffic line in the Pacific Ocean. Moreover, Japan’s indigenous defense was also affected by the Sino- Threat, therefore, the Japanese in preparation for the final struggle in mainland China. The urgent need to get through the “mainland traffic line” from northeast China to Vietnam, destroy the bases of the U.S. and China’s air forces in central and southern China, save their lonely invasion of the Nanyang Islands and keep the last passage from the mainland via North Korea if necessary. To this end, Japan