Price's Missouri Expedition, also known as Price's Raid, was an 1864 Confederate cavalry raid through the states of Missouri and Kansas during the Trans-Mississippi Theater of the American Civil War. While Confederate Major General Sterling Price enjoyed some successes during this campaign, he was decisively defeated at the Battle of Westport by Maj. Gen. Samuel R. Curtis and again defeated by the cavalry under Maj. Gen. Alfred Pleasonton at the Battle of Mine Creek, and driven back into Arkansas. Price's expedition proved to be the final significant Southern operation west of the Mississippi River. Its failure contributed to Abraham Lincoln's reelection, and cemented Federal control over the hotly contested border state of Missouri.