Changing the banner of Jin 'ou in Northeast China to quell the war in the Central Plains means that the warlord leader Zhang Xueliang electrified the whole country on February 29th 1928, announcing that he would abide by the Three People's Principles and obey the Nanjing National Government headed by Chiang Kai-shek. At the same time, he lowered the five-color flag of Beiyang Government in the northeast provinces and replaced it with the red flag of Nanjing National Government. Putting down the war in the Central Plains War meant that Zhang Xueliang launched the Xi incident and the civil war stopped. Zhang Xueliang (190 1 June 3rd -200 1 June1June 14), formerly known as Yi 'an, whose real names are Shuang and Xiao. Han nationality, born in Dongfeng Town, Dawa County, Panjin City, Liaoning Province, was born in Zhangjiawobaotun, Ejia Village, Huandong Town, Tai 'an County, Anshan City, Liaoning Province (formerly known as Sangzilin Zhanjiawopu), a general of the National Revolutionary Army, a warlord leader, and a famous patriotic general in modern China.