Jean-Baptiste Chaigneau was among the soldiers who were gathered by Father Pierre Pigneau de Behaine to support the efforts of Nguyễn Phúc Ánh to conquer Vietnam. He came to Vietnam with Pigneau in 1794.The Mandarin Road to Old Hué by Alastair Lamb , p.180 Chaigneau supported the offensives of Nguyễn Ánh, such as the 1801 naval offensive in Thi Nai.McLeod, p.11
