Nanking Incident: Foreign warships bombard Nanjing, China, in defence of the foreign citizens within the city.

The Nanking Incident, also known as the Nanking Outrage or Nanking Massacre, occurred in March 1927 during the capture of Nanjing by the National Revolutionary Army (NRA) of the Kuomintang in their Northern Expedition. Foreign warships bombarded the city to defend foreign residents against rioting and looting. Several ships were involved in the engagement, including vessels of the Royal Navy and the United States Navy. Marines and sailors were also landed for rescue operations including some 140 Dutch forces. Both Nationalist and Communist soldiers within the NRA participated in the rioting and looting of foreign-owned property in Nanjing.

Nanjing is the capital of Jiangsu, a province in East China. The city, which is located in the southwestern corner of the province, has 11 districts, an administrative area of 6,600 km² (2,500 sq mi), and as of 2021 a population of 9,423,400. Situated in the Yangtze River Delta, Nanjing has a prominent place in Chinese history and culture, having served as the capital of various Chinese dynasties, kingdoms and republican governments dating from the 3rd century to 1949, and has thus long been a major center of culture, education, research, politics, economy, transport networks and tourism, being the home to one of the world's largest inland ports. The city is also one of the fifteen sub-provincial cities in the People's Republic of China's administrative structure, enjoying jurisdictional and economic autonomy only slightly less than that of a province. It has also been awarded the title of 2008 Habitat Scroll of Honor of China, Special UN Habitat Scroll of Honor Award and National Civilized City. Nanjing is also considered a Beta city classification, together with Chongqing, Hangzhou and Tianjin by the Globalization and World Cities Research Network, and ranked as one of the world's top 100 cities in the Global Financial Centres Index.

The Republic of China (ROC) began on 1 January 1912 as a sovereign state in mainland China following the 1911 Revolution, which overthrew the Manchu-led Qing dynasty and ended China's imperial history. From 1927, the Kuomintang (KMT) reunified the country and initially ruled it as a one-party state with Nanjing as the national capital. In 1949, the KMT-led government was defeated in the Chinese Civil War and lost control of the mainland to the Chinese Communist Party (CCP). The CCP established the People's Republic of China (PRC) while the ROC was forced to retreat to Taiwan; the ROC retains control over the Taiwan Area, and its political status remains disputed. The ROC is recorded as a founding member of both the League of Nations and the United Nations, and previously held a permanent seat on the United Nations Security Council until 1971, when the PRC took China's seat in the United Nations General Assembly Resolution 2758. It was also a member of the Universal Postal Union and the International Olympic Committee. The ROC claimed 11.4 million km² (4.4 million sq mi) of territory, and its population of 541 million in 1949 made it the most populous country in the world.