In the history of China's founding of the People's Republic of China, the period of victory against Japan was the most difficult, and the period of civil war between the Kuomintang and the Communist Party was the most complicated. On the secret front of the CCP, there are many legendary agents, lurking inside the enemy, using courage and life to negotiate with the enemy and obtain confidential information, which can be described as a group of "people walking on the tip of the knife.".
After the victory of the War of Resistance Against Japan, the northeast became the focus of contention between the Kuomintang and the Communists. At this time, the CCP thought that the secret underground workers, code-named "902", went undercover at the side of the top brass of the Kuomintang Northeast Army and made great contributions. During the Liberation War, this "902" formulated a false order, which directly led to the total annihilation of the 89th Division of the Kuomintang 13th Army and the 162nd Regiment of the 54th Division.

This heavy blow forced Du Yuming to change the battle plan and enter the stage of comprehensive defense, which directly reversed the unfavorable war situation of the Northeast Coalition Army.
The agent code-named "902" is the hero , Zhao Wei.
Zhao Wei, himself a high-caliber student, graduated from the Guilin Branch of the Whampoa Military Academy, specializing in military skills such as design, design, civil engineering, surveying and mapping, strategy and tactics during his school years. Because it was too outstanding, he also got Chiang Kai-shek's parent-child reference and gave him a Zhongzheng sword engraved with the words "If you don't succeed, you will become a ren".
Although Chiang Kai-shek's intention to woo him was clear, Zhao Wei did not lose his way.
After graduation, he was assigned to the 31st Army of the Fifth Theater, and because of his outstanding achievements, he also received the weight of Li Zongren. It can be seen from here that as long as Zhao Wei is within the Kuomintang and there are no major mistakes, it can be said that the future is bright.
However, Zhao Wei did not care, he had always been concerned about the world, and serving the country was his most basic ideal. After careful consideration, Zhao Wei gave up everything in front of him and left the 13th Army.
At this time, just in time for the period of cooperation between the Kuomintang and the Communist Party, the Kuomintang secretly implemented the policy of "preventing communism, restricting communism, dissolving communism, and opposing communism," which made Zhao Wei feel confused; he secretly read many propaganda pamphlets and books that appeared in the CCP, gradually understood many advanced ideas, and became more convinced of the revolutionary theory advocated by the CCP, which allowed him to find a way to serve the country.
Zhao Wei's changes have also attracted the attention of the CCP, which has been secretly guided.
After the end of the War of Resistance Against Japan, Zhao Wei was transferred to the Kuomintang Northeast Security Command as a major staff officer. It was during this period that the leaders of the CCP's underground organization approached him. Zhao Wei originally wanted to break away from the Kuomintang and go to Yan'an, but he was still persuaded to stay within the Kuomintang and engage in intelligence work and play a greater role.
Until 1947, the Northeast Democratic United Army of Northern Manchuria crossed the Songhua River and went straight to Changchun and Yongji, while the South Manchurian Coalition Army took advantage of the fact that the Kuomintang army was increasing its strength in the north, directly took Hailong, Liuhe and other places, and surrounded Tonghua.
At this time, Zhao Wei, as a major staff officer, worked in the secret room of the Security Command, responsible for marking the Kuomintang's northeast combat situation map, and every day he would mark the dynamics of the Kuomintang and Communist forces with a flag.
Another underground worker of the CCP, Wang Shijian, has always maintained close contact with Zhao Wei, especially during the Liberation War, in order to obtain more Kuomintang intelligence, Wang Shijian's group had closer contact with Zhao Wei, and even specially dispatched underground workers of the CCP to live in the Northeast Security Headquarters under the cover of Zhao Wei.
Soon, the opportunity to turn the tide of the war came.
When the Kuomintang attacked Liaodong for the fourth time, the battle plan was as follows:
Du Yanming gathered the 60th Army, the 93rd Army, the 52nd Army, and the 13th Army, a total of 12 divisions of nearly 120,000 people, gathered in the Changbai Mountain area, preparing for a decisive battle with the Northeast Democratic United Army. Thus realizing the operational plan of "defending the north and attacking the south, first the south and then the north". The main attack force was the 89th and 54th Divisions of the Wei 13th Army, and the time of the attack was set for early April.
After Zhao Wei learned of this news, he used a small card to mark all of Du Yanming's combat intentions as the first coming, and then handed them over to the CCP underground. As an agent, such an approach is quite dangerous, and any clues may be destroyed.
The CCP was also very concerned about this information, and soon set up a secret radio station not far from Zhao Wei's work site in order to transmit intelligence in a timely manner, and also to shorten the process of intelligence transmission and ensure Zhao Wei's safety.
After the Nationalist 13th Army received Du Yanming's order, it began to transfer the 89th Division and the 54th Division to Shenyang. In order to find out the specific departure time of the Kuomintang troops, Zhao Wei specially boarded a special train at the headquarters of the Kuomintang 13th Army on the pretext of visiting his classmates.
After returning to the headquarters, Zhao Wei immediately recruited and sorted out the information, and tried his best to prevent the 13th Army and other units from assembling.
In a hurry, Zhao Wei thought of a way, so he drafted an order in the tone of the command:
Rapid electricity, commander Shi: After the troops arrived in Qingyuan, they marched quickly to Xinbin Sanyuanpu, entered the position, carried out a strong attack, and occupied the commanding heights of Lanshan Mountain.
Zhao Wei knew that the Northeast Coalition Army had also laid out positions in Lanshan, which were high mountains on three sides, and as long as the 13th Army entered, it was basically more fierce and less auspicious.
After receiving the order, the 13th Army did indeed act according to the plan, so that the 89th Division of the 13th Army and the 162nd Regiment of the 54th Division were all annihilated under the ambush of the Northeast Coalition Army.
It was this battle that directly failed the Kuomintang's fourth Liaodong battle plan, and the Northeast Democratic Coalition Army gradually took the initiative in the battle.
Many years after the founding of New China, Zhao Wei's true identity was only made public, and everyone knew the true identity of this mysterious "902" agent.