The Battle of Arkansas Post, also known as Battle of Fort Hindman, was fought from January 9 to 11, 1863, near the mouth of the Arkansas River at Arkansas Post, Arkansas, as part of the Vicksburg Campaign of the American Civil War. Confederate forces had constructed a fort known as Fort Hindman near Arkansas Post in late 1862. In December of that year, a Union force under the command of Major-General William T. Sherman left for an expedition against Vicksburg, without Major-General John A. McClernand because neither Major-Generals Henry Halleck nor Ulysses S. Grant trusted McClernand. After Sherman's force was repulsed at Chickasaw Bayou, McClernand arrived and took command from Sherman in January 1863.

John Alexander McClernand was an American lawyer, politician, and a Union Army general in the American Civil War. He was a prominent Democratic politician in Illinois and a member of the United States House of Representatives before the war. McClernand was firmly dedicated to the principles of Jacksonian democracy and supported the Compromise of 1850.