 In southeast Asia, Napoleon III was more successful in establishing control with one limited military operation at a time.In the Cochinchina Campaign, he took over Cochinchina (the southernmost part of modern Vietnam, including Saigon) in 1862, and in 1863, he established a protectorate over Cambodia.Additionally, France had a sphere of influence during the 19th century and early 20th century in southern China, including a naval base at Kuangchow Bay (Guangzhouwan).