The Nanjing War Crimes Tribunal was established in 1946 by the government of Chiang Kai-shek to judge four Japanese Imperial Army officers accused of crimes committed during the Second Sino-Japanese War. It was one of thirteen tribunals established by the Nationalist government.
The accused were Lieutenant General Hisao Tani, company commander Captain Gunkichi Tanaka and Second Lieutenants Toshiaki Mukai and Tsuyoshi Noda, made famous by the contest to kill 100 people using a sword. General Yasuji Okamura was convicted of war crimes in July 1948 by the Tribunal, but was immediately protected by the personal order of Nationalist leader Chiang Kai-shek, who retained him as a military adviser for the Kuomintang (KMT). While he was questioned by the investigators, he however testified about the Nanking massacre: "I surmised the following based on what I heard from Staff Officer Miyazaki, CCAA Special Service Department Chief Harada and Hangzhou Special Service Department Chief Hagiwara a day or two after I arrived in Shanghai. First, it is true that tens of thousands of acts of violence, such as looting and rape, took place against civilians during the assault on Nanking. Second, front-line troops indulged in the evil practice of executing POWs on the pretext of (lacking) rations."
As Iwane Matsui had been judged by the Tokyo tribunal; Prince Kotohito Kan'in, Kesago Nakajima and Heisuke Yanagawa had been dead since 1945; Isamu Cho had committed suicide and Prince Asaka had been granted immunity by General Douglas MacArthur as a member of the imperial family, Hisao Tani was the only officer prosecuted for the Nanking massacre. He was found guilty on 6 February 1947 and executed by a firing squad on 26 April. All the accused were sentenced to death in 1947.
According to the verdict of the Tribunal for Tani, on 10 March 1947, there were "more than 190,000 civilians and Chinese soldiers killed by machine gun whose corpses were burned to destroy proof. Besides, we count more than 150,000 victims of barbarous acts buried by the charity organizations. We thus have a total of more than 300,000 victims." This estimate was made from burial records and eyewitness accounts. The death toll of 300,000 is the official estimate engraved on the stone wall at the entrance of the Memorial Hall for Compatriot Victims of the Japanese Military's Nanjing Massacre in Nanjing.