The Lê Văn Khôi revolt was an important revolt in 19th-century Vietnam, in which southern Vietnamese, Vietnamese Catholics, French Catholic missionaries and Chinese settlers under the leadership of Lê Văn Khôi opposed the Imperial rule of Emperor Minh Mạng. As Minh Mạng raised an army to quell the rebellion, Lê Văn Khôi fortified himself into the Saigon fortress and asked for the help of the Siamese. Rama III, king of Siam, accepted the offer and sent troops to attack the Vietnamese provinces of Ha-tien and An-giang and Vietnamese imperial forces in Laos and Cambodia. These Siamese and Vietnamese forces were repelled in summer 1834 by General Truong Minh Giang. It took three years for Minh Mạng to quell the rebellion and the Siamese offensive.The failure of the revolt had a disastrous effect on the Christian communities of Vietnam. New waves of persecutions against Christians followed, and demands were made to find and execute remaining missionaries.