经过两年的解放战争.到1948年6月底,国民党军的总兵力已由战争开始时的430万人减少到365万人,能够用于第一线的兵力仅有170多万人,分成5个战略集团,被我军分别牵制在西北、中原、华北、东北五个战场上的少数城市里,处于被分割的孤立状态.蒋介石从1948年8月起,把全面防御改为“重点防御”,并且准备收缩兵力,撤出东北,“确保华中”. After two years of war of liberation, by the end of June 1948 the total strength of the Kuomintang army had been reduced from 4.30 million at the start of the war to 3.65 million. Only 1.7 million troops capable of using the front lines were divided into 5 A strategic group, separated by our army in a few isolated cities on the five battlefields of the Northwest, Central Plains, North China and Northeast China, was isolated and isolated from Chiang Kai-shek in August 1948. Instead, Chiang Kai-shek changed “comprehensive defense” to “key defense” , And ready to shrink the troops, withdraw from the northeast, “to ensure central China.”