The regiment was recruited in the French region of Lorraine. After recruitment, most of the regiment left from Brest, France aboard a few French ships, such as Le Héros and Le Léopard. The last of the men would arrive in Quebec City on the 31st of May 1756. They took part in the capture of Fort Oswego in August of that same year, and then escorted the British prisoners to Montreal after the battle. Régiment La Sarre played a key role in the victory at Fort Oswego losing 7 men in the process. In August 1757, many soldiers of the regiment participated in the victory at Fort William Henry. At Fort William Henry, Régiment La Sarre contributed 800-900 men of the roughly 5000 who fought in the battle itself. The fort capitulated before they had a chance to launch a full on assault on it. The reg