Recently sent to relieve Claude-Pierre Contrecœur, the Commander at Fort Dusquesne (although he had not yet officially done so), he organized the attack on the troops of General Braddock while they crossed the Monongahela river in order to besiege Fort Duquesne in New France. Leading a small force composed of regular soldiers, Canadian militia, and a majority of native Indians, he managed to defeat the British.