In March 1831, while in St. Louis, Smith requested of Secretary of War John H. Eaton a federally funded exploration of the West, but to no avail. Smith informed Eaton that he was completing a map of the West derived from his own journeys. In May, Smith and his partners launched a planned paramilitary trading party to Santa Fe. On May 27, while searching for water in present-day southwest Kansas, Smith went missing. It was learned some weeks later that he had been killed during an encounter with the Comanche – his body was never recovered.