At the end of 1949, with the guidance of the People's Liberation Army soldiers, the rule of the Kuomintang military clique on the mainland gradually collapsed, and although there were still Kuomintang troops in the southwest at that time, liberation was only a matter of time, and this problem was placed on the head of Lu Han, the chairman of Yunnan Province at that time, and that is, a few months ago, long Yun, the former chairman of Yunnan Province, electrified in Hong Kong, which made Lu Han's heart completely active.
Long Yun was the previous chairman of Yunnan Province, the warlord of the Yunnan Army, after being dismissed from all his posts by Lao Jiang in 1945, he went to Settle in Hong Kong, and finally announced the uprising under the general trend, and Lu Han was originally an important general under Long Yun, and after being inspired by Long Yun, he was also determined to lead the uprising, but at that time, although Lu Han made up his mind, the situation at that time was not allowed to do too much action, first of all, Zhang Qun, the southwest administrator of the old Chiang faction, and there was also a secret service system such as Shen Drunk, who was subordinate to the military command.

So Luhan called a military conference under the pretext of convening a military conference, and all the major generals among the generals called over for a meeting, and on December 9, as soon as these people arrived at the venue, they were detained by Luhan's troops, and by forcing them to sign the telegram of the uprising, although these people were not very petitioning, they finally signed under duress, but at that time two people expressed strong opposition, the first was Li Mi, commander of the Thirteenth Corps and commander of the Eighth Army, and the other was Yu Chengwan, commander of the 26th Army.
After Li Mi's 13th Corps was completely annihilated at the Battle of Huaihai, Lao Jiang later ordered it to be rebuilt and ordered him to be stationed in Yunnan, but Yunnan did not welcome him, so Li Mi was stationed in Chongqing again, and when the uprising was signed, Li Mi reacted most fiercely, when Li Mi's Eighth Army had made a posture to prepare to attack Kunming, so Lu Han could only appease Li Mi first and persuade Li Mi to go back to pacify the troops, but Li Mi eventually embarked on another path.
Also at that time, Yu Chengwan's 26th Army was also preparing to attack Kunming in order to save the old chief, and Yu Chengwan did not approve of the uprising at first, but after Lu Han persuaded, Yu Chengwan, who had a sense of family and country, was immediately moved, and after returning to the army with Li Mi, Yu Chengwan was ready to accept the provisional Tenth Army number given by Lu Han, and gave those who did not want to participate in the uprising 5 oceans to leave the army, but this caused great turmoil within the 26th Army.
Yu Chengwan had no choice but to stabilize the troops for the time being, and delayed the plan of the old Chiang Kai-shek's telegram to attack Kunming again and again, but in this way he also missed the best time for the uprising, Yu Chengwan saw the defeat of the army, immediately fled to Taiwan by plane, and later settled in Hong Kong, of course, as a generation of famous generals, Yu Chengwan's most famous deed was the Changde Defense War, but unfortunately such a person, in his later years, encountered misfortune, if he could have been more resolute and decisive, the development of things may be more different.