In the spring and summer of 1949, the People's Liberation Army launched an offensive under the orders of Mao Zedong and Zhu De, they crossed the Yangtze River and Nanjing was liberated on April 23 which signaled the fall of the KMT regime, Chiang Kai-Shek fled to Taiwan; on October 1, 1949, Mao Zedong standing on the rostrum of Tiananmen, solemnly declared the foundation of the People's Republic of China.