Vietnamese invasions of Cambodia
The Vietnamese invasions of Cambodia were a period of Cambodian history, between 1813 and 1845, when the Kingdom of Cambodia was invaded by the Vietnamese Nguyễn dynasty three times, and a brief period from 1834 to 1841 when Cambodia was part of Tây Thành province in Vietnam, undertaken by Vietnamese emperors Gia Long (r. 1802–1819) and Minh Mạng (r.
Source: Wikipedia — Vietnamese invasions of Cambodia (CC BY-SA 4.0)