Passaleão incident
1849 CE.
Shown on the map at 22.215°, 113.549°.
The Passaleão incident (Chinese: 關閘事件), also known as the Battle of Passaleão (or Pak Shan Lan) or Baishaling incident, was a conflict between Portugal and China over Macau in August 1849. The Chinese were defeated in the only military confrontation, but the Portuguese called off further punitive measures after a naval explosion killed about 200 sailors.
Text from the Wikipedia article Passaleão incident, licensed CC BY-SA 4.0.