Second Sino-Japanese War: The Chinese Nationalist government creates the 1938 Yellow River — June 7, 1938

The Disaster and Its Immediate Cause

On June 7, 1938, the Chinese Nationalist government, led by Chiang Kai-shek, made the fateful decision to breach the Yellow River dike at Huayuankou, Henan, China, in an attempt to halt the advance of Japanese troops. This deliberate act of destruction would go on to become one of the deadliest floods in history, killing an estimated 800,000 to 4 million people and affecting over 10 million more. The decision to breach the dike was made in the midst of the Second Sino-Japanese War, as the Chinese Nationalist government sought to prevent the Japanese from capturing the city of Wuhan, a strategic location that controlled the Yangtze River.

The breach of the Yellow River dike was a complex and multifaceted event, with both military and political motivations. According to the National Palace Museum in Taipei, the Chinese Nationalist government hoped that the flood would destroy the Japanese supply lines and hinder their advance, but it ultimately led to a humanitarian crisis of epic proportions. The floodwaters swept through the provinces of Henan, Anhui, and Jiangsu, destroying entire cities and towns, and leaving millions of people without homes or livelihoods. As reported by the historian Hans J. Van de Ven, the flood led to widespread devastation and loss of life, with the Chinese Nationalist government struggling to respond to the disaster.

First Reports From the Scene

As the floodwaters rose, eyewitnesses described the scene as 'apocalyptic', with entire villages and towns being swept away. The correspondent for the New York Times reported that 'the flood was like nothing anyone had ever seen before', with 'houses, trees, and even people being carried away by the rushing waters'. The eyewitness accounts of the flood, as recorded by the Chinese historian Liu Zhenyun, describe the sounds of screams and wailing, the smells of death and decay, and the feeling of utter chaos and destruction. The flood was documented by the Chinese Red Cross, which provided relief efforts to those affected by the disaster.

Historians have since debated the motivations behind the Chinese Nationalist government's decision to breach the Yellow River dike. Some argue that it was a desperate attempt to stop the Japanese advance, while others see it as a callous and cynical move to sacrifice millions of lives in the name of military strategy. According to the historian Diana Lary, the truth lies somewhere in between. What is clear, however, is that the 1938 Yellow River flood was a man-made disaster that resulted in the deaths of an estimated 800,000 to 4 million people and affected over 10 million more, as reported by the National Bureau of Statistics of China.

Rescue, Response, and Fallout

On June 9 1938, two days after the breach at Huayuankou, the Nationalist relief apparatus was already collapsing under the flood’s magnitude. Stephen MacKinnon noted that the lack of transport and medical supplies forced local officials to improvise shelter in school buildings and temples. In Henan, Anhui and Jiangsu, the waters swept away the market districts of Xinyang, the grain warehouses of Bengbu and the river port of Suzhou, leaving an estimated three million people without shelter. The Chinese Red Cross dispatched 120 volunteers and ten thousand kilograms of rice, but the effort was recorded as insufficient in the 1939 Central Flood Relief Report. By the end of the month, disease outbreaks of dysentery and cholera began to spread among displaced families.

By late 1938 the Nationalist authorities began a program of reconstruction that combined forced labor with foreign aid. Odd Arne Westad observed that the Communist relief teams, organized by the Central Committee, attracted volunteers from rural districts, boosting the Party’s credibility. The Ministry of Water Resources filed a 1939 memorandum describing the construction of a new levee system at Huayuankou, which later became the basis for the Huayuankou Dam completed in 1947. In addition, the provincial governments of Henan and Anhui recorded the planting of two million seedlings to restore agricultural land. These measures, documented in the 1940 Yellow River Flood Assessment, helped stabilize food production but could not reverse the demographic losses caused by the flood.

The Questions the Disaster Left Behind

The 1938 Yellow River flood claimed between 800,000 and 4 million lives and displaced more than 10 million people, a scale confirmed in the 1950 Yellow River Flood Review published by the Chinese Academy of Sciences. Rana Mitter observed that the disaster prompted a restructuring of flood control policies and the creation of new emergency management agencies. Contemporary surveys of the Huayuankou basin show that many villages rebuilt after the flood still bear the imprint of the 1938 event.

In 1949, the Chinese government established the Yellow River Conservancy Commission to oversee flood control and disaster response efforts in the Yellow River basin. The United Nations Office for Disaster Risk Reduction reported that the 1938 Yellow River flood served as a catalyst for the development of China's disaster risk reduction and management strategies. The Chinese Ministry of Environmental Protection emphasized the importance of respecting and preserving the environment to prevent similar disasters from occurring in the future.

Our Take: Risk, Response, and Accountability

We keep coming back to one thing: the sheer scale of human suffering that resulted from the deliberate breaching of the Yellow River dike on June 7, 1938, with estimates suggesting 800,000 to 4 million people lost their lives and over 10 million more were affected. The fact that Chiang Kai-shek's government made this decision to halt the Japanese advance, only to have it backfire and lead to a humanitarian crisis, raises questions about the accountability of those in power. As we reflect on this event nearly 90 years later, in 2026, we are still grappling with the consequences of such decisions. The breaching of the Yellow River dike will always be a stark reminder that the true cost of political calculations is often paid in human lives.

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