In the Seven Mountains on the Cambodian border, Khmer rebels blocked rivers and ambushed Nguyễn couriers, and joined the Siamese when they crossed the Vĩnh Tế canal. Imperial columns drove them from Tượng Sơn to Cô Tô and Tà Béc and broke them in mid-1842.
Rebellion
Thất Sơn revolt
- 1841 – 1842
- Southeast Asia
Meanwhile, elsewhere
- 1861 – 1865American Civil WarNorth America
- 17th century – 19th centuryAge of EnlightenmentEurope
- 1853 – 1856Crimean WarEurope
- 1857 – 1858Indian Mutiny of 1857South Asia
- 1845 – 1852Great Irish FamineEurope
- 1846 – 1848Mexican-American WarMesoamerica and the Caribbean
- 1851 – 1864Taiping RebellionEast Asia
- 7 May 1850Swiss francEurope