Introduction to Zhang Zuolin: Zhang Zuolin (March 19, 1875 - June 4, 1928), the father of the famous patriotic general Zhang Xueliang, known as the "King of Northeast China", the Grand Marshal of the Army and Navy of the Republic of China, and the leader of the Beiyang Army leader. After Japan's Tanaka Giichi came to power in April 1927, he demanded railway rights from Zhang Zuolin and forced Zhang to resolve the so-called "Manchu-Mongolian unresolved case", thus arousing anti-Japanese anger among the people of Northeast China. On September 4, 20,000 people demonstrated in Shenyang, shouting "Down with the Tanaka Cabinet." Under the impact of the nationwide anti-imperialist wave and Zhang Zuolin's own national consciousness, the Fengtian government failed to meet all Japan's demands for road construction, mining, factory setting, leasing land, and immigration in "Manchuria and Mongolia" and resisted. This was intolerable to the Japanese cabinet, and the Japanese Kwantung Army concluded that the anti-Japanese demonstrations of the Northeast people were caused by Zhang Zuolin's instigation, and hated him deeply.