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Great Friendship In October 1950, after the Volunteer Army headquarters set up camp in Dayu Cave, Peng Dehuai said to Mao Anying: "Anying, the morale of our army is very high, and we have coordinated with the People's Army. I think we need to have a good relationship with the people around Dayu Cave. It is difficult to do mass work because of the language barrier, but you can communicate through practical actions such as carrying water and sweeping the floor. Warm emotions can dissolve the language barrier!" Mao Anying and the security personnel followed Peng Dehuai's instructions and went deep into the surrounding North Korean people. They first came to the east forest, which was shaded by pines and cypresses, and found that there were many households along the side of the ravine, most of which were families of miners who relied on the mountains. However, there was not a single intact house in the village, and not a single villager was seen. Only the broken walls were shaking in the north wind, like a hunchbacked old woman in ragged clothes sobbing.

The espionage novel "The Dark Side" describes that on the eve of the Battle of Pingjin, the Kuomintang garrison commander Chen Changjie and Tianjin Mayor Du Jianshi, who were stationed in Tianjin, both believed that Tianjin's city defenses were impregnable and that the People's Liberation Army would not be able to capture them within half a year and three months. After Liu Ximin, the leader of the Tianjin underground party of the Communist Party of China, received instructions from his superiors to collect Tianjin city defense maps, he finally completed the task assigned by his superiors after a series of thrilling and suspenseful intelligence activities. Because the Northeast Field Army had a large amount of intelligence provided by the Tianjin underground party, especially the detailed city defense maps, the People's Liberation Army's artillery seemed to have eyes, avoiding factories, schools and residential buildings, and accurately destroyed the Tianjin city defense fortifications, which the Kuomintang called "impregnable". The original three-day battle to liberate Tianjin only took 29 hours.