Cambodia was annexed by Vietnam in 1840. Spurred by Queen Ang Mey's deposition, many Cambodian courtiers and their followers revolted against the Vietnamese rule. Siamese army entered Cambodia to install Ang Duong on the throne. Ang Em was released together with Ang Mey. In the next year, Trương Minh Giảng tried to put him on the throne as Vietnamese puppet king. Em and Mey came to Cambodia, they ordered Khmer rebels to surrender, but no one obeyed. Em died in Châu Đốc in 1843.