In 1763, after the British Conquest of New France, he and his wife, Louise Martel de Brouage, were the first French Canadian couple to be presented to the English Court, drawing the compliment from King George III that if all Canadian ladies resembled Mme de Léry, then he had "indeed made a conquest".

[2] Born in Quebec City in 1721, Chaussegros was the son of Gaspard-Joseph Chaussegros de Léry and his wife Marie-Renée, daughter of Captain René Legardeur de Beauvais (1660–1742), holder of the Grand Cross of the Order of Saint-Louis.

Chaussegros took part in raids against the British in New England, helped maintain French fortifications in New France and was in charge of the construction of Fort Saint-Jean.

In 1753, he married Louise, the daughter of François Martel de Brouague, commandant of the Coast of Labrador.

At some point, Chaussegros de Léry produced a finished copy of a map of the west.