Nakajima served as commandant of the Narashino Chemical Warfare School from 1933 to 1936. In March 1936, he was promoted to lieutenant general and was appointed a Provost Marshal. With the start of the Second Sino-Japanese War, Nakajima was appointed commander of the IJA 16th Division, and participated in the Second Shanghai Incident and operations in Hebei, China. Under the elderly General Iwane Matsui, Nakajima was named Operational Commander in the Battle of Nanjing in late-1937 and was thus the senior officer (aside from the nominal commander in chief Prince Asaka) at the time of the Nanjing massacre. Nakajima personally loaned his sword to be used in the killings at Nanjing, and laughed as he and his men carried out the massacres.[2]
^Rigg, Bryan Mark (2024). Japan's Holocaust: History of Imperial Japan's Mass Murder and Rape During World War II. Knox Press. p. 83. ISBN9781637586884.