Xi 'an Incident Xi 'an Incident (Double Twelve Incident), 1936 12 February 12, in order to persuade Chiang Kai-shek to change the established national policy of "there must be a default when busy outside" and stop the civil war, unite with Zhang Xueliang, then deputy commander-in-chief of the Northwest Anti-bandits and commander of the Northeast Army, and Yang, then commander-in-chief of the 17th Route Army of the National Revolutionary Army and commander of the Northwest Army. 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 * * * to resist Japan", and the peaceful settlement led to the second cooperation between the two countries. 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 two countries 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.