The Battle of Marais des Cygnes took place on October 25, 1864, in Linn County, Kansas, during Price's Missouri Campaign during the American Civil War. It is also known as the Battle of Trading Post. In late 1864, Confederate Major-General Sterling Price invaded the state of Missouri with a cavalry force, attempting to draw Union troops away from the primary theaters of fighting further east. After several victories early in the campaign, Price's Confederate troops were defeated at the Battle of Westport on October 23 near Kansas City, Missouri. The Confederates then withdrew into Kansas, camping along the banks of the Marais des Cygnes River on the night of October 24. Union cavalry pursuers under Brigadier General John B. Sanborn skirmished with Price's rearguard that night, but disengaged without participating in heavy combat.
The First Battle of Newtonia was fought on September 30, 1862, between Confederate soldiers commanded by Colonel Douglas H. Cooper and a Union column commanded by Brigadier General Frederick Salomon near Newtonia, Missouri, during the American Civil War. Cooper's force had moved into southwestern Missouri, and encamped near the town of Newtonia. The Confederate column was composed mostly of cavalry led by Colonel Joseph O. Shelby and a brigade of Native Americans. A Union force commanded by Brigadier General James G. Blunt moved to intercept Cooper's force. Blunt's advance force, led by Salomon, reached the vicinity of Newtonia on September 29, and attacked Cooper's position on September 30. A Union probing force commanded by Colonel Edward Lynde was driven out of Newtonia by Cooper's forces on the morning of the 30th.
The Battle of Chustenahlah was fought in Osage County, Oklahoma, on December 26, 1861, during the American Civil War. A band of 9,000 pro-Union Native Americans was forced to flee to Kansas in bitter cold and snow in what became known as the Trail of Blood on Ice.
The Battle of Poison Spring was fought in Ouachita County, Arkansas on April 18, 1864, as part of the Camden Expedition, during the American Civil War. A Union force commanded by Major General Frederick Steele had moved from Little Rock, Arkansas towards Shreveport, Louisiana in support of Major-General Nathaniel Banks' move up the Red River towards Shreveport. After Banks was defeated at the battles of Mansfield and Pleasant Hill, Steele was isolated in Arkansas. Short on supplies, Steele sent a detachment commanded by Colonel James M. Williams to search for supplies. Williams' column was attacked by Confederate troops under the command of Brigadiers General John S. Marmaduke and Samuel B. Maxey. After a sharp fight, Williams' command was routed, losing its wagon train and four cannons. The defeat at Poison Spring and another defeat at the Battle of Marks' Mills a week later led Steele to retreat to Little Rock. The battle is infamous for the Confederates' slaughter and mutilation of African-American Union soldiers of the 1st Kansas Colored Infantry. Poison Springs Battleground State Park, which is part of the Camden Expedition Sites National Historic Landmark, preserves a portion of the site of the battle.
The Battle of Honey Springs, also known as the Affair at Elk Creek, on July 17, 1863, was an American Civil War engagement and an important victory for Union forces in their efforts to gain control of the Indian Territory. It was the largest confrontation between Union and Confederate forces in the area that would eventually become Oklahoma. The engagement was also unique in the fact that white soldiers were the minority in both fighting forces. Native Americans made up a significant portion of each of the opposing armies and the Union force contained African-American units.
The Battle of Old Fort Wayne, also known as Maysville, Beattie's Prairie, or Beaty's Prairie, was an American Civil War battle on October 22, 1862, in Delaware County in what is now eastern Oklahoma.
The 1st Cherokee Mounted Rifles was a cavalry formation of the Confederate States Army in the Trans-Mississippi Theater of the American Civil War.
The Battle of Middle Boggy, also known as the 'Battle of Middle Boggy River or Battle of Middle Boggy Depot, took place on February 13, 1864 in Choctaw Indian Territory, 4 miles (6.4 km) south of what is now Allen in Pontotoc County, Oklahoma. Advancing down the Dragoon Trail toward Fort Washita, Union Colonel William A. Phillips sent out an advance of approximately 350 men from the 14th Kansas Cavalry and two howitzers to attack a Confederate outpost guarding the Trail's crossing of Middle Boggy River. The Confederate force was led by Captain Jonathan Nail and composed of one company of the First Choctaw and Chickasaw Cavalry, a detachment of the 20th Texas Cavalry and part of the Seminole Battalion of Mounted Rifles. The outpost was about 12 miles (19 km) from Muddy Boggy Depot, which was held by the Confederates. The Encyclopedia of Oklahoma History and Culture says that the battlefield was 15 miles northeast of the depot, whereas the battlefield marker says the distance was 12 miles. The Confederate force at the outpost, consisting of 90 poorly armed men, were caught off guard when Willetts attacked them. Outnumbered and outgunned, the Confederates held off the Union cavalry attack for approximately 30 minutes before retreating to the rest of Lt. Col. John Jumper's Seminole Battalion, who were not at the main skirmish. The Confederates retreated 45 miles (72 km) southwest down the Dragoon Trail. The Union advance continued south toward Ft. Washita the next day, but when the expected reinforcements did not arrive Philips' Expedition into Indian Territory stalled on February 15, near old Stonewall.
The 1st Kansas Colored Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War. It was the first black regiment to be organized in a northern state to see combat during the Civil War. At the Battle of Poison Spring, the regiment lost nearly half its number, and suffered the highest losses of any Kansas regiment during the war.
During the American Civil War, most of what is now the U.S. state of Oklahoma was designated as the Indian Territory. It served as an unorganized region that had been set aside specifically for Native American tribes and was occupied mostly by tribes which had been removed from their ancestral lands in the Southeastern United States following the Indian Removal Act of 1830. As part of the Trans-Mississippi Theater, the Indian Territory was the scene of numerous skirmishes and seven officially recognized battles involving both Native American units allied with the Confederate States of America and Native Americans loyal to the United States government, as well as other Union and Confederate troops.
The Cherokee in the American Civil War were active in the Trans-Mississippi and Western Theaters. In the east, Confederate Cherokees led by William Holland Thomas hindered Union forces trying to use the Appalachian mountain passes of western North Carolina and eastern Tennessee. Out west, Confederate Cherokee Stand Watie led primarily Native Confederate forces in the Indian Territory, in what is now the state of Oklahoma. The Cherokee partnered with the Confederacy in order to get funds, as well as ultimately full recognition as a sovereign, independent state.
The Department of Kansas was a Union Army command department in the Trans-Mississippi Theater during the American Civil War. This department existed in three different forms during the war.
Louis Henry Carpenter was a United States Army brigadier general and a recipient of the Medal of Honor for his actions in the American Indian Wars.
The Battle of Fort Smith was fought on July 31, 1864 in Sebastian County, Arkansas during the American Civil War.
The Van Buren raid was fought in Crawford County, Arkansas, on December 28, 1862, during the American Civil War. After defeating Confederate forces led by Major General Thomas C. Hindman at the Battle of Prairie Grove on December 7, 1862, Union forces under Brigadiers General James G. Blunt and Francis J. Herron prepared for a raid against the Confederate positions at Van Buren and Fort Smith. Disease, lack of supplies, and desertion had previously forced Hindman to begin withdrawing most of his force from the area. Setting out on December 27, the Union troops struck an outlying Confederate cavalry unit near Drippings Spring, north of Van Buren, on the morning of December 28. The Confederate cavalry fled to Van Buren, which was then overrun by Union troops.
The 54th United States Colored Infantry was an infantry regiment that served in the Union Army during the American Civil War. The regiment was composed of African American enlisted men commanded by white officers and was authorized by the Bureau of Colored Troops which was created by the United States War Department on May 22, 1863.
The ambush of the steamboat J.R. Williams was a military engagement during the American Civil War. It took place on June 15, 1864, on the Arkansas River in the Choctaw Nation which became encompassed by the State of Oklahoma. It is popularly termed the "only naval battle" in that landlocked state. It was a successful Confederate attack on the Union Army's lines of supply. The Confederate forces were Cherokee, Choctaw, Chickasaw and Creek Indians led by General Stand Watie, who was a Cherokee.
The Second Battle of Cabin Creek was part of a plan conceived by Confederate Brigadier General Stand Watie, who had been promoted from colonel after the First Battle of Cabin Creek. The plan was to have a Confederate force attack central Kansas from Indian Territory, raiding Union Army facilities and encouraging Indian tribes in Western Kansas to join in an attack on the eastern part of the state. Watie presented the plan to his superior, General S. B. Maxey on February 5, 1864. Maxey approved the plan on the condition that the attack would start by October 1, to coincide with an attack on Missouri already planned by General Sterling Price.
Two American Civil War military engagements were fought at the Cabin Creek battlefield in the Cherokee Nation within Indian Territory. The location was where the Texas Road crossed Cabin Creek, near the present-day town of Big Cabin, Oklahoma. Both the First Battle of Cabin Creek and the Second Battle of Cabin Creek were launched by the Confederate Army to disrupt Union Army supply trains.
United States of America (Union)
Confederate States of America 
