Question: What state is the US Army installation once commanded by Capt. W. E. Prince in?

full_context: Document 1: Trading Post, Kansas: Trading Post is an unincorporated community in Linn County, Kansas, United States, which is said to be one of the oldest continuously occupied locations in the state. In 1842 a United States Army fort was built there, but it was soon abandoned. The fort remained until probably at least 1900. It was used by troops travelling through the area during the American Civil War and a military post was established in 1861 and lasted until summer 1865. The Battle of Marais des Cygnes was fought here during the American Civil War. The location derives its name from a French trading post established there about 1825.
Document 2: United States Military Academy: The United States Military Academy (USMA), also known as West Point, Army, The Academy, or simply The Point, is a four-year coeducational federal service academy located in West Point, New York in Orange County. It was originally established as a fort that sits on strategic high ground overlooking the Hudson River with a scenic view, 50 mi north of New York City. It is one of the four U.S. military service academies, and one of the five U.S. service academies.
Document 3: Barnesville's Post: Barnesville's Post located near Barnesville, in Bourbon County, Kansas, was the site of military camps for stretches of time during the American Civil War. The first mention of a camp there came from a report written on September 4, 1861, by Sen. James Lane. This was during the time Lane had evacuated Fort Scott and moved his forces to areas north of that post. A post was established at Barnesville. Lane wrote to Capt. W. E. Prince, then commanding Fort Leavenworth, "I am holding Barnesville . . . with an irregular force of about 250 men, stationed in log buildings, and am now strengthening their position with earth entrenchments."
Document 4: Fort Leavenworth National Cemetery: Fort Leavenworth National Cemetery is a United States National Cemetery located on Fort Leavenworth, a United States Army installation north of Leavenworth, Kansas. It was officially established in 1862, but was used as a burial ground as early as 1844. The cemetery is the resting place of eight Medal of Honor recipients, but most are the unknown soldiers of war. It was named for Brigadier General Henry Leavenworth, who was re-interred there in 1902 from Woodland Cemetery in Delhi, New York. Administered by the United States Department of Veterans Affairs, it occupies approximately 36.1 acre and was site to 22,679 interments, as of the end of 2005. It is maintained by Leavenworth National Cemetery.
Document 5: United States Penitentiary, Leavenworth: The United States Penitentiary, Leavenworth (USP Leavenworth) is a medium-security United States federal prison for male inmates in northeast Kansas. It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice. It also includes a satellite federal prison camp (FPC) for minimum-security male offenders.
Document 6: Fort Leavenworth: Fort Leavenworth is a United States Army installation located in Leavenworth County, Kansas, immediately north of the city of Leavenworth, in the upper northeast portion of the state. Built in 1827, it is the oldest active United States Army post west of Washington, DC, and the oldest permanent settlement in Kansas. Fort Leavenworth has been historically known as the "Intellectual Center of the Army."
Document 7: West Point, New York: West Point is the oldest continuously occupied military post in the United States. West Point was established in 1775 by George Washington who considered it the most important strategic position in America. Until January 1778, West Point was not occupied by the military. On January 27, 1778, Brigadier General Samuel Holden Parsons and his brigade crossed the ice on the Hudson River and climbed to the plain on West Point and from that day to the present, West Point has been occupied by the United States Army. It comprises approximately 16000 acre including the campus of the United States Military Academy at West Point, which is also frequently called "West Point". It is a Census Designated Place (CDP) located in the Town of Highlands in Orange County, New York, located on the western bank of the Hudson River. The population was 6,763 at the 2010 census. It is part of the New York–Newark–Jersey City, NY–NJ–PA Metropolitan Statistical Area as well as the larger New York–Newark, NY–NJ–CT–PA Combined Statistical Area.
Document 8: Mount Oread Civil War posts: Lawrence, Kansas was not well defended in the early part of the Civil War. That ended with William Quantrill's devastating guerrilla raid August 21, 1863. By early 1864 Union soldiers were permanently camped on the top and slopes of Mount Oread, then to Lawrence's southwest. It seems the camp was originally named Camp Ewing, after Brig. Gen. Thomas Ewing.
Document 9: Fort Lane: Fort Lane, on the crest of Mount Oread, then southwest of Lawrence, Kansas, was built by the residents of Lawrence in 1856 to serve as a lookout post to observe groups of men desiring to attack Lawrence. Lawrence was a free-state community built by northerners. From 1854 to 1861, when Kansas became a state, at times the area around Lawrence was a battleground for settlers who had come from both the northern and southern states. From this location, one could see for many miles in all directions.
Document 10: Livingston's Hideout: Livingston's Hideout was most likely the only permanent Confederate military camp inside Kansas during the Civil War. It was in the very corner of southeast Kansas, in the very corner of Cherokee County, Kansas. It was about 2 mi north of the border with Indian Territory and it was less than 100 ft west of the border with Missouri. It was 5 mi west of Baxter Springs, where a series of Union military posts existed from 1862 to 1863. Thomas R. Livingston became a leader of a group of Confederate guerrillas in the area, becoming first a captain and then a major. He needed locations to hide himself and his guerrillas from pursuing Union troops and this hideout suited the guerrillas well. The guerrillas sought to spy on Union forces and raiding units he found small enough to defeat.
Document 11: Jim Lane's Fort: Jim Lane's Fort, sometimes called Fort Jim Lane, was built in August 1856 in Holton, Kansas. It was named to honor free-state leader James H. Lane, who helped organize the settlement of several towns in northeast Kansas Territory, including Holton. Holton was settled by about fifty free-state settlers at the time the fort was built. The fort, built to serve as a place of refuge for the townspeople, was built of logs. It measured 20 ft by 30 ft .
Document 12: Fort Riley: Fort Riley is a United States Army installation located in North Central Kansas, on the Kansas River, also known as the Kaw, between Junction City and Manhattan. The Fort Riley Military Reservation covers 101733 acre in Geary and Riley counties. The portion of the fort that contains housing development is part of the Fort Riley census-designated place, with a residential population of 7,761 as of the 2010 census. The fort has a daytime population of nearly 25,000. The ZIP code is 66442.
Document 13: Leavenworth, Kansas: Leavenworth is the largest city in and the county seat of Leavenworth County, Kansas, United States. As of the 2010 census, the city population was 35,251. Located on the west bank of the Missouri River 25 mi northwest of Kansas City, Missouri, it is part of the Kansas City metropolitan area.
Document 14: Fort Riley (CDP), Kansas: Fort Riley is a census-designated place (CDP) that covers part of Fort Riley, a US Army installation in Geary and Riley counties in the U.S. state of Kansas. The population was 7,761 at the 2010 census, down from 8,114 at the 2000 census, at which time the CDP was known as Fort Riley North.
Document 15: Fort Baxter (Kansas): Fort Baxter, also known as Fort Blair, was a small US Army post located in the southeast corner of Kansas near present-day Baxter Springs. This area was known as the Cherokee Strip. It was one of a few Kansas forts attacked by Confederate forces during the American Civil War. At one point the Confederate government claimed authority over the Neutral Lands. Both Union and Confederate troops operated in the area, as did guerrilla forces and militias prevalent in the Kansas-Missouri border area.
ground_truth: Kansas