He was the son of Michel-Sidrac Dugué de Boisbriand and Marie Moyen Des Granges. As a French military officer, Dugué held a succession of posts from 1699 to 1726 at France's settlements on the Gulf Coast and on the Mississippi River in present-day Illinois. He served at various times as commander of outposts at Mobile, Natchez, Louisiana, and the area known as the Illinois Country during his military career. Dugué was a cousin and fellow officer of brothers, with whom he served on expeditions during French colonization in North America. Their achievements included capturing English fortifications in Canada, and founding the colonies at Mobile and New Orleans. In 1719, Dugué led an expedition to the area south of present-day St. Louis. Eighteen miles north of the Jesuit mission at Kaskaskia, he established an outpost that he named Fort de Chartres. The fort became the center of military and civilian activity in the area known as Upper Louisiana and the Illinois Country. From 1724-1726, Dugué served in New Orleans as Governor of Louisiana in the first French era after his predecessor Bienville returned to France for an extended period of time. While commandant of Fort de Chartres, Dugué conveyed land nearby to his nephew, Ste. Therese Langlois, who founded the town of Prairie du Rocher on the site. The town is one of the oldest French colonial communities to survive into the 21st Century in the American Midwest. Like several other French colonial commanders, Dugué was recalled to France in the 1720s to answer charges of mismanagement. He was then replaced as governor of Louisiana by Étienne Périer in 1727. He lost his military commission, but was later awarded a pension by the king. He died in France on June 7, 1736. Regarding the name Dugué, translation errors and imprecision led to several spellings, including "Duguay", "Dugay" and "Duqué". The name "Boisbriand", which refers to the family's property in Canada, also appears as "Boisbriant". Sometimes, this name is used alone. Thus, "Pierre Dugué, sieur de Boisbriand" is sometimes identified as simply "Sieur de Boisbriand" or even "Pierre Boisbriand" in contemporary texts.
