For the adjacent park, see Fort Steilacoom ParkFort Steilacoom was founded by the U.S. Army in 1849 near Lake Steilacoom. It was among the first military fortifications built by the U.S. north of the Columbia River in what was to become Washington. The fort was constructed due to civilian agitation about the massacre in 1847 at the Whitman mission.Indians of the Nisqually tribe attacked white settlers in the area on October 29, 1855, as a result of their dissatisfaction with the Treaty of Medicine Creek that had been imposed on them the previous year, particularly angered that their assigned reservation curtailed the traditional fishing economy. The fort was headquarters for the U.S. 9th Infantry Regiment during this "Indian War" of 1855-56. In the course of the conflict, Volunteer U.S. Army Colonel Abram Benton Moses was killed. At the conclusion of the war, Territorial Governor Isaac Stevens brought Chief Leschi of the Nisqually tribe to trial for the death of Moses during a skirmish at Connell's Prairie on October 31, 1855.
