Introduction to Japanese Colonization: After the "September 18th" Incident in 1931, in order to solve the energy supply problem, the Japanese imperialists seized the Xi'an coal mines with armed force, frantically plundered coal resources, and implemented the policy of "requiring coal but not people, exchanging people for coal" The "human flesh mining" policy bribes traitors and leaders, and uses methods such as recruiting, arresting, forcing, and deceiving to drag innocent people from Shandong, Shanxi, Hebei, Henan and other places to the mines, where they are required to work as hard as cattle and horses, and live without clothes. A miserable life without enough food and body.