Henry Leavenworth (December 10, 1783 – July 21, 1834) was an American soldier active in the War of 1812 and early military expeditions against the Plains Indians.After the war, he then served in the New York State Assembly, in 1816,[2] and then he went to Prairie du Chien as Indian agent, and on February 10, 1818, was made lieutenant-colonel of the Fifth U. S. Infantry.General Leavenworth died in the Cross Timbers in the Indian Territory, on land near modern Kingston, Oklahoma, on July 21, 1834,[4] of either sickness or an accident while buffalo-hunting;[5] while leading an expedition against the Pawnee and Comanche.His regiment erected a monument at Cross Timbers; he was first buried in Delhi,[6] with his remains later reinterred at Fort Leavenworth National Cemetery.[7] He was married three times, first to Elizabeth Eunice Morrison, with whom he had two children, and divorced, then to Electa Knapp, who died within the year, then to Harriet Lovejoy, with whom he had another child.