Background: The Fall of Nanking

In December 1937, Japanese Imperial Army forces captured Nanking (now Nanjing), then the capital of the Republic of China. What followed over the next six to eight weeks became known as the Nanking Massacre — or the Rape of Nanking — one of the most extensively documented war crimes of the Second World War, and among the most catastrophic single episodes of mass violence in modern history.

The fall of Nanking came after months of intense fighting across China. Japanese military command had publicly promised a swift campaign, and the lengthy resistance had frustrated and angered troops. When the city fell on December 13, 1937, restraint largely collapsed.

What Happened

The events within Nanking following the city's fall included:

  • Mass executions of prisoners of war and civilians — many shot in groups along riverbanks or buried alive
  • Widespread sexual violence — tens of thousands of women and girls were raped; this was systematic and widespread across the city
  • Looting and arson — large sections of the city were burned, with civilian property destroyed on a massive scale
  • Killing contests — Japanese newspapers reported, and apparently celebrated, competitions among officers for the most kills with a sword

Contemporary accounts were recorded by foreign nationals who remained in the city and established what became known as the Nanking Safety Zone — a protected area covering several square kilometers where some 200,000 civilians sought refuge. Among those foreigners was John Rabe, a German businessman and Nazi Party member, whose diary became one of the most important primary source documents of the atrocity.

Scale and Death Toll

Estimating casualties from the Nanking Massacre remains deeply contested. Scholarly estimates range widely:

  • The Chinese government and the Nanjing Massacre Memorial Hall cite figures of approximately 300,000 deaths.
  • The International Military Tribunal for the Far East (Tokyo Trials) estimated over 200,000 civilians and prisoners of war killed.
  • Some Japanese and Western historians place the figure lower, in the range of 100,000–200,000.
  • A minority of Japanese nationalist scholars dispute whether the events constituted a massacre at all — a position that is not accepted by the mainstream scholarly or legal community.

The disagreement is partly methodological (different geographic and temporal boundaries applied to the event) and partly political, as denial has been leveraged in Japan-China diplomatic tensions for decades.

The Tokyo Trials and Accountability

The International Military Tribunal for the Far East (IMTFE), often called the Tokyo Trials, convened from 1946 to 1948 to prosecute Japanese leaders for war crimes and crimes against peace. The Nanking Massacre featured prominently in the proceedings.

General Iwane Matsui, commander of the Japanese forces that captured Nanking, was found guilty of failing to prevent the atrocities despite being aware of them. He was executed in December 1948. Prince Asaka Yasuhiko, a member of the imperial family who also commanded troops during the occupation of Nanking, was controversially granted immunity as part of the broader decision to exempt Emperor Hirohito and the imperial family from prosecution.

Historical Memory and Denial

The Nanking Massacre occupies a deeply painful place in Sino-Japanese relations. Japan's postwar handling of the historical record — including the revision of school textbook language describing the events — has caused repeated diplomatic crises. Several Japanese politicians have publicly minimized or denied the scope of the massacre, drawing sharp rebukes from China and South Korea.

In 2015, China submitted documents related to the Nanking Massacre to UNESCO's Memory of the World Register — a decision Japan protested. The episode illustrates how historical atrocities remain active political and cultural wounds long after military conflict ends.

Significance for International Law

The Nanking Massacre remains a foundational case study for several reasons: it demonstrates how quickly military discipline can collapse into organized atrocity; it shows the importance of documentation and witness testimony even in wartime; and it raises unresolved questions about command responsibility and the limits of diplomatic immunity when applied to members of ruling elites.