Treaty of Saigon
The French overpowered the Vietnamese stationed in Da Nang, swiftly occupying the city and Tiên Sa peninsula (present-day Sơn Trà peninsula). The occupying forces were quickly placed under siege by the Vietnamese army under the command of Nguyễn Tri Phương, and were eventually forced to retreat in March 1860. The French were able to invade the southern stronghold of Saigon and, in June 1862, several provinces of southern Vietnam were ceded to the French as Cochinchina with the signing of the Treaty of Saigon.