Daniel-Hyacinthe-Marie Liénard de Beaujeu was born on August 9, 1711, in Montreal, New France. He belonged to a prominent Canadian military family. His father, Louis Liénard de Beaujeu, was an officer and seigneur, and his mother, Thérèse-Denise Migeon de Branssat, came from another established colonial family. Daniel grew up in a society where military service, the fur trade, seigneurial obligations, and relationships with Indigenous nations shaped elite life. French authority beyond the St. Lawrence settlements depended on officers who could move between these worlds.

Beaujeu entered the colonial regular troops, the troupes de la Marine, while young. His education was practical and military, acquired through garrison duty and service at western posts rather than through a formal academy. He learned Indigenous diplomatic customs, the importance of gift exchange, and the seasonal rhythms governing travel by canoe and snowshoe. He also became familiar with the dispersed network of forts connecting Montreal to the Great Lakes and Mississippi Valley.

In 1737 Beaujeu married Michelle-Élisabeth Foucault, strengthening his ties to the colonial elite. His assignments included command at Fort Niagara and Fort Michilimackinac, two posts where the officer in charge acted as soldier, magistrate, trade regulator, and diplomat. He worked closely with Odawa, Ojibwe, Potawatomi, and other nations whose cooperation could never be taken for granted.

During King George’s War, Beaujeu gained further experience organizing Canadian and Indigenous war parties. By the early 1750s he was a seasoned captain known for personal courage and knowledge of western warfare. He took command of Fort Duquesne shortly before a large British army advanced toward it in 1755. His entire upbringing and career had prepared him for a style of command based on mobility, alliance, local intelligence, and rapid action rather than the massed formations of European battlefields.