The Battle of Marais des Cygnes () took place on October 25, 1864, in Linn County, Kansas, during Price's Missouri Raid in 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. Overnight, Sanborn's troops were reinforced by cavalry under Lieutenant Colonel Frederick W. Benteen, bringing the total Union strength to 3,500. The battle began early the next morning as Sanborn drove Major General John S. Marmaduke's Confederate rearguard from its position north of the river. Union troops captured cannons, prisoners, and wagons during this stage of the fighting. Marmaduke attempted to make a stand at the river crossing, but his position was outflanked by a Union cavalry regiment, forcing him to abandon it. A rearguard action by Confederate Brigadier General John B. Clark Jr.'s 1,200-man brigade bought Price more time to retreat and disengage. Some of Price's men were still caught near Mine Creek later that morning and were badly beaten in the Battle of Mine Creek. That evening, the Battle of Marmiton River became the day's third action, after which Price burned his supply train so it no longer slowed the retreat. After another defeat at the Second Battle of Newtonia on October 28, Price's column retreated to Texas through Arkansas and the Indian Territory. Only 3,500 of the 12,000 men Price had brought into Missouri remained in his force. Background When the American Civil War began in 1861, the state of Missouri was a slave state, but did not secede because the state was politically divided. Governor Claiborne Fox Jackson and the Missouri State Guard (MSG) supported secession and the Confederate States of America, while Brigadier General Nathaniel Lyon and the portion of the Union Army under his command supported the United States and opposed secession. Under Major General Sterling Price, the MSG defeated