The Xi incident, also known as the "Double Twelve Incident". 1936 65438+February 12. In order to persuade Chiang Kai-shek to change the established national policy of "there must be a default in the busy outside", stop the civil war and unite against Japan. Zhang Xueliang, then Deputy Commander-in-Chief of Northwest Anti-bandits and Commander-in-Chief of Northeast Army, and Yang Hucheng, then Commander-in-Chief of 17th Route Army of National Revolutionary Army and Commander-in-Chief of Northwest Anti-bandits, launched "remonstration" in Anhua Qingchi, and detained Chiang Kai-shek, then Chairman of the Military Commission of the National Government and Commander-in-Chief of Northwest Anti-bandits, which was called "Xi An Bing remonstrance" in history. Under the leadership of the Central Committee of the Communist Party of China and Zhou Enlai, Chiang Kai-shek finally accepted the idea of "stopping the civil war and uniting with the Communist Party to resist Japan", which was settled peacefully and contributed to the second cooperation between the Kuomintang and the Communist Party. The peaceful settlement of the Xi 'an incident became the pivot to change the situation, and the ten-year civil war ended. The second cooperation between the Kuomintang and the Communist Party (non-party cooperation) was initially formed, and the anti-Japanese national United front was initially formed, which became a turning point from the civil war to the anti-Japanese national war.