Price's Missouri Expedition

Price's Missouri Expedition (August 29 – December 2, 1864), also known as Price's raid or Price's Missouri raid, was an unsuccessful Confederate cavalry raid through Arkansas, Missouri, and Kansas in the Trans-Mississippi Theater of the American Civil War. Led by Confederate Major General Sterling Price, the campaign aimed to recapture Missouri and renew the Confederate initiative in the larger conflict.

Despite several early victories, Price was ultimately defeated at the Battle of Westport by Union forces under Major General Samuel R. Curtis in late October. He suffered further reverses at the hands of Union cavalry under Major General Alfred Pleasonton at the Battle of Mine Creek, Kansas, forcing him to retreat back into Arkansas. Price's Missouri Expedition proved to be the last significant Southern operation west of the Mississippi River. Its failure bolstered confidence in an ultimate Union victory in the war, thereby contributing to President Abraham Lincoln's re-election. It also cemented Federal control over the hotly contested border state of Missouri.

After three years of bloody fighting, Confederate authorities were becoming desperate as the U.S. presidential election approached during the fall of 1864. The Union controlled the key western rivers and cities, Sherman was moving through Georgia, and Lee was tied down to the defense of Richmond. With foreign recognition now hopeless, Abraham Lincoln's re-election would be disastrous for their cause.

Earlier that summer, the Confederacy had ordered General E. Kirby Smith, commander of the Trans-Mississippi Department, to send a corps under Lieutenant General Richard Taylor across the Mississippi River to assist in the defense of Atlanta and Mobile. Such a crossing was impossible because of Union gunboat patrols on the river and Taylor was assigned to other duties.

Inspired by preparations to divert Union attention from Taylor's crossing, Smith came up with another plan. He would recapture Missouri for the Confederacy, in the hope that it would help turn Northern opinion against Lincoln. He ordered Missouri-native Sterling Price to invade his home state and advance on St. Louis, capturing the city and its military arsenals. If St. Louis was too heavily defended, Price was to turn west and capture Jefferson City, the state capital. Price was then told to cross into Kansas and turn south through the Indian Territory, "sweeping that country of its mules, horses, cattle, and military supplies".

Price assembled a force he named the Army of Missouri, consisting of 12,000 men and fourteen artillery pieces. His army was divided into three divisions under Maj. Gen. James F. Fagan, Maj. Gen. John S. Marmaduke, and Brig. Gen. Joseph O. "Jo" Shelby. However, the infantry units originally assigned to Price were ordered to the Western Theater, changing his mission from a full-fledged invasion into a cavalry raid.

Price's men were a mixture of the best and the worst, a full quarter of them being deserters who had been returned to duty. Hundreds of Price's men marched barefoot, and most lacked basic equipment such as canteens and cartridge boxes. Many carried jugs for water and kept their ammunition in shirt and pants pockets. Nevertheless, Price hoped the people of Missouri would rally to his side. In this he proved to be mistaken, as most Missourians did not wish to become involved in the conflict. Only mounted bands of pro-Confederate guerrillas joined his army, perhaps as many as 6,000 altogether.

The Union Army in Missouri included thousands of Missouri State Militia cavalry, which would play a key role in defeating Price, together with the XVI Corps of Maj. Gen. Andrew J. Smith. These were augmented by Maj. Gen. Alfred Pleasonton's cavalry division, detached from William S. Rosecrans's Department of Missouri. As Price commenced his campaign, Smith's corps was on naval transports leaving Cairo, Illinois, to join Gen. William T. Sherman's army in Georgia; Rosecrans requested these troops be assigned to Missouri to deal with the threat, and Army Chief of Staff Henry W. Halleck immediately complied. By mid-October, more troops had arrived from the Kansas border under Maj. Gen. Samuel R. Curtis, Price's old adversary at the Battle of Pea Ridge and commander of the newly activated Army of the Border. Curtis commanded the divisions of Maj. Gen. James G. Blunt (cavalry), Maj. Gen. George W. Dietzler (Kansas Militia), Pleasonton's cavalry, and two infantry divisions from Smith's corps under Colonels Joseph J. Woods and David C. Moore—about 35,000 men in all. The Confederates were already greatly outnumbered.