Before the war, Amherst had dismissed the possibility that Indians would offer any effective resistance to British rule, but that summer he found the military situation becoming increasingly grim. He wrote the commander at Fort Detroit that captured enemy Indians should "immediately be put to death, their extirpation being the only security for our future safety." To Colonel Henry Bouquet, who was preparing to lead an expedition to relieve Fort Pitt, Amherst wrote on about June 29, 1763: "Could it not be contrived to send the small pox among the disaffected tribes of Indians? We must on this occasion use every stratagem in our power to reduce them." Bouquet responded that he would try to spread smallpox to the Indians by giving them blankets that had been exposed to the disease. Amherst replied to Bouquet on July 16, endorsing the plan.