Thiệu Trị
On the An Giang Front, "Chao Phraya" Yommaraj Bunnag and Prince Ang Duong had led Siamese armies in January 1842 to take the Vĩnh Tế Canal and An Giang Province and penetrated into Hậu Giang Province. Nguyễn Công Nhân was unable to repel the Siamese attacks, and Thiệu Trị sent Tôn Thất Nghị with reinforcements. Phạm Văn Điển, the governor of the An Giang and Hà Tiên Provinces, had joined to defend An Giang but died of illness in April 1842.