Fort Washita was established in 1842 as the southwestern-most post in the United States. (Beyond the borders to the south and west was the Republic of Texas which had recently won its independence from Mexico.) The purpose of the post was to protect the Chickasaw and Choctaw Indians from the Plains Indians. For centuries the latter had used this area for hunting and were not happy with newcomers settling in the area. Troops stationed at Fort Washita from time to time in the 1840s included the 2nd Dragoons, the U.S. Regiment of Riflemen, the 6th Infantry, the 7th Infantry, and the 5th Infantry. During a portion of the 1850s the post served as the United States Army Field Artillery School. Throughout the 1840s and 1850s the post provided quarters for the United States Indian Agency to the Chickasaw and Choctaw governments. On April 16, 1861, the fort was abandoned by U.S. forces under the command of Colonel William Emory. The next day Fort Washita was occupied by Confederate forces and used during the War Between the States. For the next hundred years, the buildings were used by members of the Colbert family who were leaders of the Chickasaw Nation. The fort was acquired by the Oklahoma Historical Society in 1962 and has been designated as a National Historic Landmark.

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On May 19, 1858, proslavery men killed five free state men and wounded five others in a ravine that is now listed as a National Historic Landmark. The shootings shocked the nation and became a pivotal event in the "Bleeding Kansas" era. A few months later, abolitionist John Brown came to the site and constructed a fortified cabin. Visitors to the site can learn more about free-staters and border ruffians and their stories.

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Fort Mims site commemorates the Fort Mims battle which took place August 30, 1813. The attack on Fort Mims is considered a leading cause of the Creek War of 1813-1814.

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This one-acre park in Manila surrounds the gravesite of and monument to Private Herman Davis, Arkansas farm boy and war hero. Fourth on General John J. Pershing's list of World War I's 100 greatest heroes, Private Davis received the Distinguished Service Cross, the Croix de Guere, and the Medaulle Militaire awards from the American and French governments.

The site is open to the public.

Website does not specify any interpretive services available at the site.