Siege of Fort Detroit had apparently been informed of Pontiac's plan, and the garrison of about 120 men was armed and ready. Pontiac withdrew and, two days later, laid siege to the fort. A number of British soldiers and civilians in the area outside the fort were captured or killed; one of the soldiers was ritually cannibalized, as was the custom in some Great Lakes Indian cultures. The violence was directed only at the British: French colonists were left alone. Eventually more than 900 Indian warriors from a half-dozen tribes joined the siege. On May 28, a supply convoy commanded by Lieutenant Abraham Cuyler
Siege of Fort Pitt McClure would write in his journal, "I was informed at Pittsburgh, that when the Delawares, Shawanese & others, laid siege suddenly and most traitorously to Fort Pitt, in 1764, in a time of peace, the people within, found means of conveying the small pox to them, which was far more destructive than the guns from the walls, or all the artillery of Colonel Boquet's army, which obliged them to abandon the enterprise." Siege of Fort Pitt The Siege of Fort Pitt took place during June and July 1763 in what is now the city of Pittsburgh, Pennsylvania, United States. The