The Nagasaki incident (長崎事件? Nagasaki Jiken), also known as the Nagasaki―Qing Navy Incident (長崎清国水兵事件), was a riot involving Chinese Beiyang Fleet sailors in Nagasaki.
On 1 August 1886 (Meiji 19), the Qing Dynasty's navy called the Beiyang Fleet, the four warships, the Dingyuan (定遠), the Zhenyuan (鎮遠), the Jiyuan (濟遠), and Weiyuan (威遠), entered the Nagasaki harbor port during a visit to various major Asian harbours. At that time, China (Qing Dynasty) was much stronger than Japan. The Dingyuan was a heavier ship than the heaviest Japanese cruisers. In addition, Japan had suffered a setback during the Gapsin Coup in which 400 Japanese soldiers were defeated by 2000 Qing soldiers.
On August 13, 500 Chinese troops took part in shore leave. They went to the red-light district, where during an altercation with locals, damanged fixtured were blamed on the visitors. Local also claimed that drunken Chinese soldiers went around the city pursuing women and children, causing outrages. Nagasaki Prefecture Police Department tried to intervene together with a large number of local civilians. As a result, the policemen and Chinese soldiers began to fight hand-to-hand in sword battles within the city. There were at least 80 deaths on both sides, and the soldiers were arrested. They used swords purchased from stores. As a result, a sense of unrest thus pervaded.
On August 14, at a conference between the governor of Nagasaki prefecture, Kusaka Yoshio, and the Qing consulate Xuan Cai, the Qing navy prohibited its soldiers from going on land as a group for one day, and agreed that when soldiers are on leave, they would be overseen by an officer.