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Fort Kearny
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Fort Kearney | |
Restored Fort Kearny State Park | |
| Nearest city | Newark, Nebraska |
|---|---|
| Coordinates | 40°39′N 99°0′W / 40.650°N 99.000°W |
| Area | 80 acres (32 ha) |
| Built | 1848 |
| NRHP reference No. | 71000485 |
| Added to NRHP | July 2, 1971 |
Fort Kearny was a historic outpost of the United States Army founded in 1848 in the Western United States during the middle and late 19th century. The fort was named after Colonel and later General Stephen Watts Kearny.[1] The outpost was located along the Oregon Trail near Kearney, Nebraska. The town of Kearney took its name from the fort. The "e" was added to Kearny by postmen who consistently misspelled the town name.[2] A portion of the original site is preserved as Fort Kearny State Historical Park by the Nebraska Game and Parks Commission.[3]
The fort became the eastern anchor of the Great Platte River Road and thus an important military and civilian way station for 20 years. Wagon trains moving west, were able to resupply after completing about a sixth (16%) of the journey. The fort offered a safe resting area for the eastern immigrants in this new and hostile land. Livestock could be traded for fresh stock and letters sent back to the states. The fort continued to expand over the years, until there were over 30 buildings before its closure in 1871. It took on additional roles as a Pony Express station, an Overland Stage station and a telegraph station.[4]
Origins and various missions of the fort
[edit]The fort was built in response to the growth of overland emigration to Oregon after 1845. The first post, Fort Kearny, was established in the spring of 1848 "near the head of the Grand Island" along the Platte River by Lieutenant Daniel P. Woodbury. It was first called Fort Chiles,[5] but in 1848 the post was renamed Fort Kearny in honor of General Stephen Watts Kearny.[6]
In 1848, the Pawnee Nation negotiated a major treaty with the US government at Fort Kearny. Noted diplomat Jeffrey Deroine, a formerly enslaved man, served as an interpreter for this treaty.[7][8]
Despite its lack of fortifications, Fort Kearny served as way station, sentinel post, supply depot, and message center for 49'ers bound for California and homeseekers traveling to California, Oregon and the Pacific Northwest. The earliest surviving photograph of the post, taken in 1858 by Samuel C. Mills, shows the post as a collection of adobe buildings without any wall or fortifications. By the 1860s, the fort had become a significant state and freighting station and home station of the Pony Express. During the Indian Wars of 1864–1865, a small stockade was apparently built upon the earth embankment still visible. Although never under attack, the post did serve as an outfitting depot for several Indian campaigns.
The fort was a precious source of provisions for emigrants on the early section of the trail for several decades during the height of the trail use until its abandonment in 1871. As it had been founded along the Platte River to protect emigrants on the trail westward, the fort became an important stop along the eastern part of the trail for the following decade, offering the sale of food, reliable mail service and other amenities. At the height of the pioneer trail use in the 1850s, as many as 2,000 emigrants and 10,000 oxen might pass through in a single day during the height of the trail season in late May.
One of the fort's final duties was the protection of workers building the Union Pacific. In 1871, two years after the completion of the transcontinental railroad, the fort was discontinued as a military post. Its buildings were disassembled and moved West to outfit newer posts.
Description
[edit]The fort was intended mostly as a supply post, and not as defensive position in the Indian Wars. Throughout most of its history, the fort consisted mostly of wooden buildings surrounding a central parade ground without fortified walls. Throughout the decades of its use until the completion of the transcontinental railroad, the character of the buildings became slightly more permanent, changing from adobe and sod structures to wooden frame construction. Although it was in the heart of area inhabited by American Indians aka Native Americans, and was near the center of hostile action in the 1860s, no direct attack was ever made on the fort.
History
[edit]First Fort Kearny
[edit]The fort along the Platte River was the second of two army posts in present-day Nebraska to be named after Colonel Stephen W. Kearny of the US Army. In 1838, Kearny had scouted the area along the Missouri River at the mouth of Table Creek near present-day Nebraska City looking for a suitable location for an outpost to protect westward travelers. In 1846, following Kearny's recommendation, the United States War Department had ordered the building of an outpost on the site and directed Kearny to construct one there. The Army then sent Colonel Kearny with a detachment of men from Fort Leavenworth up the Missouri to the area with orders to construct an outpost at the selected site.[9]
The Army constructed a two-story wooden blockhouse on the site, which became known as Camp Kearny and later Fort Kearny. The Army quickly realized, however, the location was not chosen well, since few emigrants passed the site on their way west. Instead, the main routes of the trails preferred by emigrants lay to the north near Omaha and to the south. Construction was subsequently halted on the site, with the exception of the erection of a number of log huts for temporary quarters for a battalion of troops who wintered there in 1847–1848.
Second Fort Kearny
[edit]In September 1847, Kearny sent topographical engineer Lt. Daniel P. Woodbury westward along the Platte looking for a more suitable location for the outpost. Woodbury selected a site in present-day central Nebraska near the spot where the Trail westward from Independence, Missouri joined the trail westward from Omaha and Council Bluffs. Woodbury described the spot in his journals as:
- I have located the post opposite a group of wooded islands in the Platte River ... three hundred seventeen miles from Independence, Missouri, one hundred seventeen miles from Fort Kearny on the Missouri and three miles from the head of the group of islands called Grand Island.
In December Woodbury went to Washington, D.C., with orders to secure organization of the new post. Woodbury requested an appropriation of $15,000 for construction, while advocating the employment of Mormon emigrants for construction. Although he did not receive these provisions, Woodbury received permission to build the fort from scratch with soldier labor.
The Army abandoned the Table Creek post in May 1848 and arrived at the new site in June. Woodbury directed construction of the fort with 175 men as labor. They built wooden buildings around a four-acre (16,000 m2) parade ground, with cottonwood trees planted around the perimeter. Woodbury initially named the fort "Fort Childs" after Col. Thomas Childs, a famous soldier in the Mexican–American War, as well as Woodbury's father-in-law. A directive from War Department, however, directed that the name "Fort Kearny" would be transferred to the new fort.[10]
The fort grew rapidly into an important trail stop. By June 1849, Woodbury noted in his journals that 4,000 wagons had passed the fort so far that year, mostly on their way to California. The fort accumulated large stores of goods for travelers, with the directive of selling them at a beneficial cost to the emigrants. Specifically, the commander of the fort was authorized to sell goods at cost to emigrants, and in some cases of hardship, to give goods to them for free. In 1850, the fort acquired regular once-a-month mail service with the arrival of a stagecoach route between Independence, Missouri and Salt Lake City. It was the first regular mail service established along the trail.
Trail Junction
[edit]Fort Kearny's location was chosen based on its proximity to the junction of several existing smaller trails, which joined into a single broader route that became known as the Great Platte River Road. At this location, immigrant trains from the Missouri River trail head converged[4] and thousands of overland travelers passed by the fort each year. The Armies two functions included protection and aid to the thousands of emigrants moving westward and to protect the Indian tribes from the migrants and from other tribes. Over time, road ranches grew up nearby. Dobytown became the first settlement providing supplies and entertainment to the emigrants and the soldiers.[11]
- Eastern Trailsheads
- Westport near Kansas City, used by most emigrants.
- Fort Leavenworth
- St. Joseph, Missouri
- Nebraska City became a major freight center during The Mormon War and after the discovery of gold in the Colorado and Montana Territories (1858-1865). Freighters found the Ox-Bow Trail, with more abundant grass and water although longer and prone to having muddy lowlands. This was replaced in 1858 by the "Steam Wagon Road" which was a more direct route and improved after 1862.[12]
- Omaha, along with Florence, Nebraska, which served the Mormon Pioneers from Winter Quarters.
Role in the Indian Wars
[edit]
The early years of the fort were relatively peaceful. After 1854, and the creation of the Nebraska Territory by the Kansas–Nebraska Act, the area around the fort in northern Kansas and southern Nebraska increasingly came under the hostile activity of the Cheyenne and Sioux tribes.[10] In the summer of 1864, the irritation of the Native Americans at the encroachment by white settlers culminated in violent attacks on wagon trains along the Platte and the Little Blue River. During this time, soldiers from the fort began escorting wagon trains, and the fort became a center for refugees fleeing from attacks. Earthwork fortifications were constructed at the fort, and the Army ordered the deployment of the First Nebraska Cavalry and the Seventh Iowa Cavalry to the fort. By 1865, the conflict between Native Americans and white settlers had shifted westward away from the area of the fort.[11]
Later years and abandonment
[edit]The construction of the Union Pacific Railroad across Nebraska starting in 1865 largely marked the end of the need for a fort to protect and supply wagon train emigrants. Following the completion of the transcontinental railroad in 1869, the US Army issued an order for abandonment of the post on May 22, 1871. In 1875, the buildings were torn down and the materials removed to barracks at North Platte and Sidney. The troops of the fort were restationed to Omaha and its stores were relocated to Fort McPherson 70 miles (110 km) to the west. In December 1876, the grounds were given over to the United States Department of the Interior for disbursement to settlements under the Homestead Act. Within several years, little remained of the fort except for cottonwood trees and the 1864 earthwork fortifications.[13]
Fort Kearny State Historical Park
[edit]In 1928, the Fort Kearny Memorial Association was formed by Nebraska citizens to raise money to purchase and restore part of the grounds. The organization was able to purchase 40 acres (16 ha) of the original site, which it offered to the State of Nebraska.[3] The State Legislature authorized the purchase, which became final on March 26, 1929. Thus acquired by the State of Nebraska in 1929, part of the original site is now operated as Fort Kearny State Historical Park by the Nebraska Game and Parks Commission. The site has been entered on the National Register of Historic Places.[10]
In cooperation with the Nebraska Game and Parks Commission, which operates the current State Historic Park, the Nebraska State Historical Society conducts ongoing archaeological investigations of the grounds. These digs have uncovered and marked the foundations of all major building on the site including headquarters, officers and troops quarters, parade grounds, storage and livestock stockade. A small theatre that shows a 20-minute history of the fort, a museum with collected artifacts and a reconstructed blacksmith shop with period cannons, caissons, tack and other equipment is behind the museum. There is space on the park for RV and trailer parking with some facilities. The park is only open during the summer months. Reenactors fire the authentic cannon every year on 4 July weekend ceremonies.
In June 2010, Governor Dave Heineman signed a Proclamation re-establishing the 2nd Battalion, Nebraska Veteran Cavalry; the unit will be at the Fort on three major holidays, Memorial Day weekend, July 4 weekend, and Labor Day weekend. This historical cavalry unit served at the fort during the Indian Wars, the unit is historically correct in every possible aspect; bugle calls used by the cavalry can be heard at differing times to announce the activities of the troop at the fort.
Depiction in fiction
[edit]In the novel Around the World in Eighty Days by Jules Verne, a train in the process of being hijacked by Sioux stops at Fort Kearny to request aid from the troops there. Such an event is somewhat of an anachronism, given that the conflicts with Native Americans had largely shifted away from the area by the time of the completion of the railroad.
The fort is prominently mentioned and described as a stop along the Oregon Trail in 1855 in the novel Westward Hearts (Homeward on the Oregon Trail Book 1) by Melody Carlson, 2012 chapter 25.
Fort Kearny also appears in the short-lived television western drama series The Loner starring actor Lloyd Bridges. The series, created and written by Rod Serling of "The Twilight Zone" fame, takes place in the late 1860s and features the fort in an episode titled "Westward the Shoemaker". The "Westward..." episode concerns an Eastern European Jewish immigrant who seeks a new life in Nebraska Territory as a bootmaker but runs afoul of a card shark.
The fort is mentioned in the introduction to an episode of the TV series Wagon Train, "The Willy Moran Story" as the next destination of the settlers.
The fort is also referenced in the HBO television series Deadwood in episode 5 of the first series as the closest place to find smallpox vaccine.
The fort is mentioned in the 2014 film The Homesman, as the post Tommy Lee Jones character was stationed when a soldier with the US Dragoons.
The fort is a stop in the Oregon Trail video game.
The fort is mentioned in the Song "One Black Sheep" by Mat Kearney
The fort is featured in the series "Hell on Wheels" where the shows protagonist Cullen Bohannon was imprisoned awaiting execution but was saved by and old ally named Doc.
See also
[edit]References
[edit]- ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Department of the Interior. pp. 172.
- ^ Ellis, Mark (2006). Kearney. Arcadia Publishing. p. 7. ISBN 9780738541280.
- ^ a b "Fort Kearny State Historical Park". Nebraska Game and Parks Commission. Retrieved August 1, 2018.
- ^ a b Comprehensive Management and Use Plan, Oregon National Historic Trail, Appendix III; Selected Historic Sites and Cross-Country Segments, Status and Recommendations; National Park Service, United States Department of the Interior; Washington, D.C.; August 1981; page 69-70
- ^ Letter datelined "Nebraska Territory May 26th 1849" to Chillicothe, Illinois, entered the mails with "Fort Leavenworth, Mo./June 14" datestamp, Spink Shreves Galleries, https://stampauctionnetwork.com/f/f12122.cfm, last accessed January 14, 2019: ""...wee are within Ten miles of fort Kerney formerly called fort Chiles…" named for Col. Joseph Chiles.
- ^ Persijs Kolberg, Curator of Historic Sites (May 17, 1971). "Fort Kearny". National Register of Historic Places Inventory Nomination Form. National Park Service. Retrieved August 1, 2018.
- ^ Olson, G. (2015). Jeffrey Deroine: Ioway Translator, Frontier Diplomat. United States: Truman State University Press.
- ^ Judd, Catherine Nealy. (2023) "Building New Fort Kearny, 1848: The Pawnee Nation, William Tappan, and Powell's Missouri Volunteers." Great Plains Quarterly 43</i, no. 2: 157-183. https://doi.org/10.1353/gpq.2023.a908051.
- ^ Old Fort Kearny; Otoe County Historical Society, Historical Land Mark Council; East Central Avenue, Nebraska City; Otoe County, Marker 36; Nebraska Dept of Transportation; Lincoln, Nebraska; obtained 2016
- ^ a b c The National Survey of Historic Sites and Buildings, Volume XII; Soldiers and Braves, Historic Places Associated with Indian Affairs and the Indian Wars in the Trans-Mississippi West, Robert G. Ferris (Ed), United States Department of the Interior, NPS, Washington, D.C. 1971 pg 206–07
- ^ a b Kearney-Fort Kearny: Department of Roads; Nebraska State Historical Society, Kearny Rest Area, I-80 E, Buffalo County; Marker 200
- ^ Nebraska City-Fort Kearny Cutoff; Nebraska State Historical Society; Nebr. 2, northwest of Syracuse - Otoe County; Marker 143; Nebraska Department of Transportation, Lincoln, NE, retrieved 2015
- ^ Fort Kearny; Nebraska Game and Parks Commission, Nebraska State Historical Society, Fort Kearny State Historical Society; Kearny County, Marker 229; Nebraska Dept of Transportation; Lincoln, NE, obtained 2016. Fort Kearny was the first major fort.
Further reading
[edit]- Barnes, Jeff. Forts of the Northern Plains: Guide to Historic Military Posts of the Plains Indian Wars. Mechanicsburg, PA: Stackpole Books, 2008.
External links
[edit]
- Fort Kearny State Historical Park Nebraska Game and Parks Commission
- Fort Kearny State Historical Park and State Recreation Area Maps Archived 2018-08-02 at the Wayback Machine Nebraska Game and Parks Commission
Fort Kearny
View on GrokipediaFort Kearny was a United States Army outpost established in 1848 on the south bank of the Platte River in central Nebraska to protect emigrants traveling the Oregon, California, and Mormon Pioneer Trails.[1] Named for General Stephen W. Kearny, it marked the eastern terminus of the Platte River Road and functioned as the first permanent military installation west of Missouri dedicated to emigrant security.[2] The fort provided essential resupply services, mail relay via the Pony Express, and served as headquarters for satellite outposts along the trails, while also supporting military campaigns against Plains Indian tribes amid rising tensions over emigrant incursions.[1][3] Despite its strategic location amid heavy traffic—hundreds of thousands of wagons passed annually—it experienced no direct attacks and operated primarily as a logistical depot rather than a combat fortress.[3] Deactivated in 1871 due to the obsolescence of overland trails following transcontinental railroad completion, the site transitioned to civilian use and is preserved today as a state historical park.[3][2]
Location and Strategic Importance
Selection of Site and Environmental Factors
In September 1847, Lieutenant Daniel P. Woodbury of the U.S. Army Corps of Engineers led an expedition to select a new site for Fort Kearny, following the abandonment of the original post near the Missouri River.[2] On October 2, Woodbury reached the Platte River near the head of Grand Island, approximately three miles upstream from the selected location, and chose a site in present-day Kearney County, Nebraska, opposite wooded islands in the river.[4] This position was 317 miles west of Independence, Missouri, and 197 miles from the first Fort Kearny, marking a convergence point where major westward trails from the Missouri River merged into the Platte River Road.[4] Woodbury cited several advantages for the location, including a slight elevation that protected against seasonal flooding from the Platte, proximity to the heaviest concentration of timber among the Grand Island group for construction and fuel needs, and access to natural hay bottoms for livestock forage.[4] The wooded strip along the river's islands and south shore—featuring cottonwood, elm, willow, ash, and scattered cedar—provided the most reliable local source of building materials in an otherwise timber-scarce prairie environment, extending about 40 miles downstream.[5] Additionally, the site's strategic placement aimed to maintain peace between the Pawnee and Sioux tribes while facilitating oversight of emigrant traffic.[4] Environmental factors heavily influenced the choice, as the Platte River offered a vital water source despite its braided, shallow channels (main channel about 0.75 miles wide) prone to quicksand and variable flow, flanked by wide prairie island bottoms and bayous.[5] The surrounding Great Plains terrain was flat and open, ideal for wagon passage and fort layout but exposed to extreme weather, including high winds, temperature swings, and semi-arid conditions with limited vegetation beyond riverine grasslands.[6] These constraints necessitated adaptations like adobe and sod construction, as natural timber remained insufficient for large-scale logging.[5]Position Relative to Emigrant Trails
Fort Kearny was established in 1848 on the south bank of the Platte River in present-day Buffalo County, Nebraska, at the strategic junction where numerous eastern feeder trails converged into a unified route westward.[1] These trails emanated from jumping-off points in Missouri, Iowa, and Kansas, channeling emigrants onto the Platte River Road, which extended approximately 330 miles west to Fort Laramie in Wyoming.[7] This convergence point marked the onset of the primary overland corridor through the Great Plains, facilitating the flow of thousands of settlers annually during the mid-19th century.[1] The fort's location along the Platte River valley provided essential protection for emigrants traversing the Oregon Trail, California Trail, and Mormon Pioneer Trail, as it represented the first U.S. military installation dedicated to safeguarding travelers beyond the Missouri River.[7] [1] Prior to its construction, no permanent army posts existed between the Missouri River and the Rocky Mountains to offer organized defense against potential threats from Native American tribes or natural hazards.[1] Soldiers at Fort Kearny conducted patrols, enforced order, and supplied provisions, thereby reducing risks for wagon trains navigating the featureless plains where water sources and reliable routes were critical.[1] This positioning not only centralized military oversight for the trails but also enabled rapid response to disturbances along the Platte corridor, which saw peak traffic between 1849 and 1860, with estimates of over 400,000 emigrants passing through the area.[7] The river's north and south forks guided the trail's path, with Fort Kearny serving as a key landmark approximately 200 miles west of the Missouri River, underscoring its role in the logistical backbone of American westward expansion.[1]Establishment and Construction
Origins in Westward Expansion Policies
The doctrine of Manifest Destiny, popularized by New York journalist John L. O'Sullivan in 1845, provided ideological justification for U.S. territorial expansion across North America, framing it as a divine imperative to spread American institutions and democracy to the Pacific.[8] This belief underpinned federal policies encouraging emigration, including land grants and promotion of overland routes, amid growing American settlement in disputed Oregon Country territories, where U.S. population rose from about 150 in 1840 to over 5,000 by 1845. The resolution of the Oregon boundary dispute via the June 15, 1846, treaty with Britain secured unambiguous U.S. claims north of the 49th parallel, spurring a sharp increase in wagon trains departing Independence, Missouri, as settlers sought fertile lands under incentives like the 1843 provisional government's appeals for reinforcements.[9] To support this migration amid vulnerabilities from harsh plains terrain and potential Native American interference—though organized opposition remained minimal in the 1840s—the federal government prioritized military safeguards along the Oregon Trail. On May 19, 1846, President James K. Polk signed congressional legislation authorizing the establishment of posts to protect overland travelers, reflecting a strategic commitment to secure supply lines and assert federal presence in newly claimed regions.[10] [11] These measures addressed the exponential growth in emigrant volume, with thousands of families annually traversing the Platte River corridor after 1846, necessitating forward bases for resupply, escort patrols, and deterrence of disruptions that could undermine settlement momentum.[12] Fort Kearny originated directly from this policy framework, as the U.S. Army in 1847 identified the Platte River's south bank—where California, Oregon, and Mormon trails converged—as a critical midpoint requiring a permanent outpost roughly 200 miles west of the Missouri River.[2] Initially designated Fort Childs, construction commenced in June 1848 under Captain William A. Bertine and detachments including the Mormon Battalion, transforming a sod-and-log encampment into a symbol of federal facilitation for expansionist goals.[13] By December 1848, War Department General Order No. 66 redesignated it Fort Kearny in honor of Colonel Stephen W. Kearny, emphasizing its role in bridging policy intent with practical security for the demographic tide that would populate the Great Plains and beyond.[4]Relocation from First to Second Fort Kearny
The initial Fort Kearny, established in June 1846 near present-day Nebraska City on the Missouri River, served as a supply depot for westward expeditions but proved inadequately positioned for safeguarding the burgeoning emigrant traffic along the Platte River corridor.[2] [14] Originally designated Fort Childs after its constructor, Colonel Thomas Childs, the post's eastern location—approximately 200 miles from the Platte trails—limited its utility in providing timely aid to travelers on the Oregon, California, and Mormon routes, prompting military leaders to seek a more central site amid rising overland migration following the Mexican-American War.[4] [3] In September 1847, Lieutenant Daniel P. Woodbury of the U.S. Army Corps of Topographical Engineers led a reconnaissance expedition that identified a suitable location on the south bank of the Platte River, near the head of Grand Island in what is now Kearney County, Nebraska; this site offered access to water, timber from nearby islands, and proximity to the trails while facilitating supply lines from the Missouri.[2] On March 12, 1848, Battalion Commander Leven Enos Powell departed the original fort with engineers and a detachment to commence construction, selecting 35 acres purchased from the Pawnee tribe for $2,000 worth of goods as per a treaty agreement.[2] [15] By late May 1848, the original fort was fully abandoned as troops and materials transferred westward, with the new outpost—initially a rudimentary sod-and-log enclosure—operational by June under the renamed Fort Kearny, honoring General Stephen Watts Kearny for his role in the conquest of California.[2] [16] The relocation, involving roughly 300 soldiers from the 1st Dragoons and support units, enhanced logistical efficiency by aligning the garrison directly with the Platte Valley's north-south trail convergence, reducing response times to emigrant needs and potential threats from Plains tribes.[4] [14] This shift underscored the U.S. Army's adaptive strategy in frontier defense, prioritizing trail security over static Missouri River basing amid annual emigrant volumes exceeding 50,000 by 1849.[3]Physical Description and Infrastructure
Layout and Key Facilities
Fort Kearny's layout centered on a rectangular parade ground measuring approximately 4 acres, surrounded by essential military buildings constructed primarily from adobe, sod, frame, and later brick materials.[17] The post occupied a 10-mile square reservation, with the fort situated half a mile south of the Platte River, featuring a central flagstaff on the parade ground for drills and assemblies.[17] Early structures from 1848-1850 relied on local sod and adobe bricks produced by soldiers, transitioning to frame buildings as lumber became available; by 1852, maps depicted about six primary buildings encircling the open square.[18] Defensive additions in 1864 included earthworks and a wooden stockade enclosing 1 acre around the core facilities.[17] Key facilities included enlisted barracks on the east side, comprising two-story frame structures housing up to 100 men, alongside a one-story 70-by-24-foot frame barracks with a 50-by-25-foot kitchen wing in the southeast corner.[18] Officers' quarters lined the south and west sides, built as two-story frame blocks completed by 1850.[17] [18] A frame hospital with four rooms was erected in fall 1849, while the guardhouse, a small frame structure on the north side, featured an 8-by-15-foot floor pit for confinement.[17] [18] Quartermaster and commissary warehouses stood north of the parade ground, including a 132-by-24.5-foot commissary with root cellar; an initial adobe storehouse in the southeast was replaced by 1859.[18] The sutler's store, adjacent to the parade ground, provided goods to troops and emigrants.[17] Support structures encompassed a sod blacksmith-carpenter shop (35 by 70 feet) east-central, and in 1864, Fort Mitchell, a 238-by-278-foot earthwork southeast with internal sod ruins for enhanced defense.[18]