While several U.S. forts existed in the general area visited by the missionaries, this may refer to Fort Leavenworth, which Lewis Dana apparently visited on this mission. In November 1845 Dana and his wife traveled to Fort Leavenworth and noted that the American Indians there “expresed great joy on our return.” (Lewis and Mary Dana, “Indian Territory,” to Patten or James Lemon, Montrose, Iowa Territory, 16 Dec. 1845, Brigham Young Office Files, CHL.)
Brigham Young Office Files, 1832–1878. CHL. CR 1234 1.