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The colonization of Cochinchina – which was the European name for the southern part of Vietnam – occurred in two phases between 1858 and 1867.

Historical background

Following the Second Opium War, the French government of Napoleon III, with the help of Spanish and Filipino troops arriving from the Philippines (which was a Spanish colony at the time), decided to take over the southern part of Vietnam.

First phase of colonialization

Napoleon III was instrumental in establishing the stronger French presence in the region. In 1858, the emperor approved a naval operation under Rigault de Genouilly, initially said to provide security for French Catholic missionaries there. The operation escalated, and by 1861, it had turned into an invasion. By 1862, hostilities ceased and in the following negotiations Vietnam was forced to cede three provinces to the French. This eventually became French Cochinchina.

French Cochinchina opened three major ports for essentially unrestricted French trade and allowed French navy ships free passage to Cambodia. Although French Cochinchina also gave French missionaries free rein, it did not stop hostilities between the Vietnamese and the Christian missionaries and their Vietnamese converts.

Timeline of the first phase

In September 1, 1858, France occupied Đà Nẵng (Tourane). On 18 February 1859, they conquered Saigon and three southern Vietnamese provinces: Biên Hòa, Gia Định and Đinh Tường; on 13 April 1862, the Vietnamese monarchic government was forced to cede those territories to France as part of the Treaty of Saigon.

Timeline of the second phase

In 1867, French authorities claimed that Emperor Tu Duc was not abiding by the treaty and that he was secretly supporting Vietnamese guerrillas who were trying to drive the French out of the three provinces. They used this to justify another attack to gain three more provinces. The provinces of Châu Đốc, Hà Tiên and Vĩnh Long were added to French controlled territory. In 1874, all the French territories in southern Vietnam were declared to be the new French colony of Cochinchina.

French Indochina
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